Read This Before Flashing ACCST 2.0 to Taranis

by Oscar

Frsky recently released a new firmware, “ACCST D16 2.X.X”, for their transmitter modules and receivers. However there are some downsides if you flash ACCST 2.0, one of which is that all of your tiny whoops and micro quads with 3rd party Frsky-compatible receivers will stop working with your radio.

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What is ACCST 2.0?

Frsky recently released a new version the ACCST firmware – “ACCST D16 2.X.X“.  This is for all of their receivers and XJT modules (including external modules and internal modules inside the Taranis).

However, if you flash ACCST 2.0 to your radio, it will no longer work with receivers with original ACCST protocol. This basically breaks compatibility with all 3rd party receivers, such as those built-in receivers in the Tiny Whoops.

If you flash your R-XSR with ACCST 2.0, it will stop working with 3rd party radios, such as the Jumper T16. (probably what Frsky wants)

Additionally, if you flash your Taranis with ACCST 2.0, you will also have to flash all of your Frsky receivers too, this can be a lot of work.

AND… the latest ACCESS firmware (as on 04 Feb 2020) doesn’t seem to support ACCST 2.0, yet… Hopefully the next ACCESS firmware update will address that.

Is There Any Benefit to Upgrade ACCST 2.0?

According to FrSky

  1. Fixed the channel output error (uncontrolled servo movements) under certain conditions.
  2. Strengthened correction and verification capability.

I have been flying with the original ACCST D16 firmware since 2013, and never had any issues with the mentioned bug. And if you only use D8, then this update does nothing for you at all.

For me the downsides totally outweigh the benefits (which is nothing IMO), so I probably won’t bother with updating ACCST 2.0. That’s just me, you should decide for yourself.

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Ludde.B 16th March 2023 - 9:40 am

Flying season is closing and it’s time to setup some new models and upgrade the transmitter. Man I wish I skipped the later part!!
unfortunately I don’t have any backup on anything (you live u learn).
I use a accst radio with a 4 in 1 module.

Xjt non eu 170317 flashed
Rx6r fcc 180516 flashed
Bootloader 2.3.15
4 in 1 v
(Won’t binde with internal xjt)

In setup, mode it says XJT before protocol, does anyone know how to get rid of the XJT, I don’t think it should be there. ??

Can’t find a solution on the www.

And to all of you who have their gear in order 👏🏻👏🏻👏🏻!

Thomas Nahrath 6th November 2022 - 10:15 pm

Do you know where I can downloadcthe Accst v1 version for a Tarsnis X7 q?
I would like to downgrade hoping to be able to use a crossover receiver.

Andrey 8th September 2021 - 4:45 pm

Hi Oscar,

I have XSR-SIM usb thingy for sim, it currently works with both my Radiomaster T8 Pro (gamepad-like Tx) and X9D+. I assume, all of them are running version 1.X ACCST fw. If I flash XSR-SIM and X9D+ iXJT to 2.X ACCST, will T8 Pro stop working with XSR-SIM?

Oscar 12th September 2021 - 5:48 pm


Kelly Hall 1st September 2021 - 8:52 pm

Just getting back into FPV from 2017. My qx7 radio works fine but wondering if I can/ should updated open tx to a newer version. And if so what version can I updated to without getting the problematic frsky accst version??

Oscar 1st September 2021 - 9:20 pm

I don’t think you should update it unless you have to :)
If you are still just flying with your old Frsky receivers, then there’s no need TBH.

Chris Bevando 20th January 2022 - 2:23 am

What does that mean? Can you like say it in a dumb way so I can try to get my gear to work I have rxsr Ted+ and I’ve inverted and upverted hell I’m feeling xverted but no go on flying

Christoffer Gylin 15th May 2021 - 2:23 pm

Do you know where I can find th pre-ACCST 2.0 firmware for XM+ so it works with my old school Taranis?

Oscar 15th May 2021 - 5:12 pm

See previous comments on this post.

Tori 19th April 2021 - 7:27 pm

I have a QX7 and tried binding it with my XM+ receiver and it didn’t work. I went on the website of where I got the receiver and it said I have to flash my firmware to V2, then bind it. After reading the problems people have with this update I don’t know if it’s the right move though. If anybody was successful at binding the XM+ with the QX7 transmitter, what steps did you take to make it happen? Any info would help, thanks (I’m completely new at this)

Oscar 20th April 2021 - 5:20 pm

You just download the ACCST V2 firmware from Frsky’s website, then flash it to your receiver.
Instructions on how to flash: Flashing Frsky Receiver using Flight Controller Pass-Through

Greg Bouten 6th April 2021 - 3:18 am

I am extremely new to FPV having only flown DJI drones. I bought a drone from Ray State Quads. My receiver is a RadioMaster TX12S. They told me to flash my FrSky R-XSR With this protocol. Everything I’ve read shows you flashing using one of theirradios. Is the procedure the same using my radio? Can you point me to what firmware I should flash. Thank you,

Oscar 6th April 2021 - 9:36 am

1. RadioMaster TX12S is a radio transmitter, not a receiver.
2. ACCST 2.0 doesn’t support 3rd party receivers and transmitters (such as Radiomaster). This protocol is only made for Frsky’s receivers and transmitters.

nebiyu mesfin 26th March 2021 - 12:54 pm

my tx is version 2.2.2 but my rx is 2.1.0 how to connect please help me

Keith whitmer 19th March 2021 - 3:47 am

I am a newbie..been asking for 1 1/2 years what upgrades I need for my radio x9d plus 2019..I still don’t know..all I wanted to do is get connected and fly it ain’t happened yet.

Jim Sorenson 24th January 2021 - 5:24 am

Well, this is the post that just keeps on giving, doesn’t it? I decided to do a sweeping update on my X-Lite including updating the iXJT module to 2.1.0. Then I tried to bind a new XR6 receiver, and it refused to to bind. I was a little concerned about my existing models, since one uses a 3rd-party D16 receiver (TinyHawk II), and another has the receiver really buried deep within a molded foam fuselage. After reading this post, I quickly used my backup file to restore the iXJT functionality.

(sigh) Frsky’s attempt to thwart Jumper (a company I admittedly have issues with) smacks that of the Keurig 2.0 coffee machine with the DRM scanner. The cost of customer frustration will be far too high.

Anyhow, thanks for clearing this up. I may eventually update and use my multi-module to handle the legacy and 3rd-party receivers, but I’ve yet to have an issue with the current stock.

Jamil 20th September 2020 - 1:11 am

o no no way i only have a tinyhawk 2 freestyle …it was working great and then for some reason i kept seeing everywhere u have to flash this flash that so i did it on my radiomastert16s…..and today was the 1st day i had a chance to try and fly it and nothing…it didnt work it said my rf whas good but nothing happend when i turned it on…im brand new to flying drones and i was super excited when i got the freestyle 2 and i like it so much that i bought the radiomaster tx16s and i ordered a pair of skyzone 02x goggles which im currently still waiting for ….buit now my deones not working ever sense i did that stupid flash and also when i tried to flas the sd it messed up too ..and for some reason now all the swtiches i set up arent working or nothing is very fustrating …. it works in betaflight but thats it is this why its not working? please help me get my drone up and working again …im super bummed right now

david 11th September 2020 - 2:46 pm

Oscar – you are THE man

scott 30th July 2020 - 3:17 pm

Any updates on this situation?

Vitaly Lukiantsev 9th June 2020 - 7:07 pm

After I realized that the new ACCESS protocol will not be added to my only two-year-old Taranis Qx7, I also learned that the latest receivers will not have firmware for compatibility with ACCST. Great business move for idiots. Accordingly, I didn’t hesitate to sell the Taranis Qx7 and bought a radio master with already installed hall sticks, a color screen, a multiprotocol module and other bonuses.
So I wish a speedy ruin of FRSKy.

alex 4th June 2020 - 6:44 am

so I did an update to my rxsr to firmear 2.1.0… and only after It wouldn’t bind to my x9d+ did i realize I wasn’t supposed to do that. does any one have an idea how to revert my rxsr to a non 2.1.0 firmware or even have an older version of the firmeware?
i can’t find it online anywhere help?

Roy 25th May 2020 - 3:35 pm

Oscar can you put Pre D8 2.x.x. Firmware for XJT Lite Module on my mail please? I cant find it, otherwise i cant bind my Mobula HD (NonEU).

Marek 14th May 2020 - 3:23 pm

“FrSky have removed all old firmware from their website.
Does anyone have D16 V1.xx firmware for X4Rsb and Rx6R.”

This is not the case. Under the current firmware, there’s link to the older one:

History firmware DOWNLOAD (not compatible with v2.x.x)

Ömer Albayrak 29th April 2020 - 3:58 pm

Hi Oscar,

As an avid reader of your posts all the time, I wish I read your blog first for this issue.
Now I’m up to rollback. downloaded XJT-Ver170317 for my X9D plus.
The weird thing is, I never had a problem until I updated the TX and all RX’s to V2.1.0
now I see something like an uncontrolled ail-pitch movement on my quads. even in close range on the GT-R90
and own build quads. I hope I can fix this with the rollback.

Oscar 3rd June 2020 - 12:11 am Reply
Ian Paisley 24th March 2020 - 5:41 pm

FrSky have removed all old firmware from their website.
Does anyone have D16 V1.xx firmware for X4Rsb and Rx6R.

Frank 17th March 2020 - 10:04 pm

Thanks for all the hard work Oscar and posting all this great information. You saved me a lot of pain and frustration with this your site rocks and always has good information on the sport. I am never taking this update since I have a lot of D8 Whoops.

Martin 11th March 2020 - 12:47 am

Moi mon woop newbee drone bind en accst 2,0 tout fonctionne a1 ?

Chuck 26th February 2020 - 9:50 pm

Oscar. Thank you from saving me. I was very close to upgrading to 2.xx. I have been using V 171009 for several years now on my R-XSR receivers and I have not witnessed any problems. According to FRSky’s web site the latest non-2.xx version for R-XSR is 191112 for the FCC version non F. Port. Do you believe that version will be safe? I am running the latest OpenTX and I believe that includes the firmware in the XD9 Plus. Correct? No reason to upgrade the transmitter firmware. Just let OpenTX do it for me.

MIke 23rd February 2020 - 12:03 pm

I bought a used x-lite, how can I tell which version is on?

Oscar 11th March 2020 - 8:37 pm

With TX module, you can’t. Just try to bind it see if it works. Or download a firmware version that you like to have on your module.

Spem 19th February 2020 - 2:42 pm

I wonder what FW version will ship with the latest manufacturing run Taranis X9D 2019 transmitter & receivers? Downgrading is a pain but possible for the moment – but it wouldn’t take much to lock the code.
I decided to buy an IRangeX multiprotocol module to give me the max of possibilities.

Jan 18th February 2020 - 1:24 pm

Is it possible to rollback on QX7 ? On the frsky page there is only the update file, but no older files for the XJT ….

Estevan Bataglia 9th February 2020 - 4:40 pm

Hi Oscar,

I decided to go ahead and flash my whole fleet to ACCST 2.0. I don’t have 3rd party receivers nor D8 so I thought, why not.. But then, the telemetry of my planes just went crazy. I sent a note to FrSky and they acknowledged the issue but no solution.

I tried to roll back all receivers to 1.x but now when I try to flash the old fw version via external module interface, I see a error message on the radio and rx boots. this happens to all RX’s XM+, S8R, X4R, R8X-PRO….

I sent another complaint to FrSky and NO RESPONSE….

I was wondering if you would have any advice on how to refresh the old firmware back on my receivers.

Did you experience this issue? Do you have any tips or advice to me?

Thank you. Appreciate your job deeply!

Ray 7th February 2020 - 6:59 pm

@Jim Tapp aka Protonus

As long as the hardware continues to allow us to use older FW, then yes people like you and I are fine. If they change that we are screwed.

Van 6th February 2020 - 2:22 pm

After going through the same thing with crossfire, bought a jumper….problems solved

Jeffrey Rodriguez 6th February 2020 - 2:47 am

I recently got into the fpv hobby for January 2020. It was a pain in the ass updating my remote thinking I was doing everything correctly following instructional videos online step by step. Then finally got my taranis x9 lite updated to the newest firmware, only to not be able to bind to my tiny whoop with f4 flight controller because of this stupid update. I literally returned the remote and upgraded to a qx7 thinking it was a bad remote and then did the same thing again updated everything to the newest firmware to not be able to bind to any of the 2 drone whoops I bought because I thought the first drone was the problem. Thanks frsky for all the money / time/ effort and sleepless nights wasted on a remote I would other wise enjoy.

Joe 6th February 2020 - 1:50 am

I had the exact same problem recently. I had to resort to the previous firmware on all my recievers. Glad to see it wasn’t just me!

Jonathan Ott 4th February 2020 - 8:54 pm

Oscar, I updated my QX7 just before all this trouble came about. Can I flashback to something prior to 2.X.X, like 190905? Do I need to revert my OpenTX backwards too, like to 2.3.0 (I’m on 2.3.1 right now)? I haven’t flashed any receivers yet.

Oscar 18th February 2020 - 12:09 am

Yes you should be able to flash older firmware, just download it from Frsky’s website, should be on the same page as the 2.X.X firmware. No need to touch OpenTX.

Pancho 29th April 2024 - 10:16 pm

I have an old taranis qx7 accst that I updated using opentx to version 2.3.15

It worked with all my old receivers I didn’t have to update any of them. I recently bought a mobula 6 and I can’t get it to bind in either xjt d16 or xjt d8. Do I/ can I go back to the old version I had on my transmitter that would actually show just regular d8? I think I found two links on frskys website but not sure if that’s what I need to do or how?

Jim Tapp aka Protonus 4th February 2020 - 8:54 pm

Since you can downgrade firmware on new receivers you buy, and you aren’t forced to take module / radio updates… there’s really no reason you ever HAVE to take this update, right? I’m in this weird, yet awesome place with my FrSky gear where everything works amazing.
I have an original X-Lite (ACCST) on the latest OpenTX. I’ve got a bunch of R-XSR’s running the latest F.PORT firmware, and some XM+ and SPI receivers too.
I also have the new R9M Lite Pro for it, running latest FLEX firmware on 1 Watt output. I use it with their STAB receiver in simple wings, their Slim+ in FC wings, and the R9MM OTA’s in my longer range quads. Al are using the latest 1.x ACCESS firmware… also working great.
I also have a Vantac MPM Lite for flying my toy grade planes, like my Volantex Ranger 600. Also, works great!
I might just leave all these firmwares alone forever given this