Autel Evo II downgrade issues? DH has a solution!

Quad808 · Jul 28, 2021

Cicero24 said:
Yes. I just tried it out for the heck of it. I was indeed able to downgrade to V2.5.18 without issue by doing as he said. It worked!

Nice! Makes me wonder if they got heads up on DroneHacks find for the downgrade file name, or maybe they didn't translate it back to english. Great work on trying this out!

Quad808 · Jul 28, 2021

Anzacjack said:
Whats the advantage of downgrading?
am i missing something here?

For some, an earlier version of firmware may work better than a more recent one. It's always good to have an option to downgrade if this happens to your drone.
I would caution anyone from downgrading more than one previous version at a time, in other words don't skip a version. Maybe nothing will happen, maybe it will.
I don't know how the Autel drones handle firmware flashing....with the DJI drones, you can skip firmware versions, BUT once a module has been upgraded like NFZ, it will stay upgraded. I would hope that when downgrading firmware it would just downgrade all modules to the lower version. This would need to be validated before and after you downgrade to check all the versions. For DJI's firmware, if the firmware downgrade has the same version of firmware for a module, the flashing skips it. Dunno about Autel. There is always risk in flashing firmware if the code is not written well with many checks. DJI's firmware flashing code is basically crap. At DroneHacks, the flashing code for firmware flashing had to be re-written with checks in it to counter the crappy DJI programming. We have not looked at Autel firmware flashing code yet. Not enough interest sadly.

Cicero24 · Jul 28, 2021

PingSpike said:
Nicely done Al Bundy!

2.5.18 was the version they introduced aircraft-activation.

Nobody has been able to roll back to a version prior to this.

I wonder if this trick will allow this now? ?

I’ll try the one before 2.5.18 out of curiosity tomorrow and report back.

davshev · Aug 8, 2021

I just did the downgrade on my Evo II Pro from V2.7.25 to 2.6.22. You have to rename the file from force_uprade to qiangzi_shengji. This works as of 8/8/2021. Tested the drone out after the upgrade and everything works.

Antonello · Aug 9, 2021

Quad808 said:
My friends...
we are working on it, giving the Evo line some loving.
It has been tested and almost ready to release.
FREE 99!
You read that right. F R E E. Sit tight a while. Along with our great partners at DDD, lots of Autel firmware available.
You don't like the current problems with 2.5.0? Well then...downgrade to the previous version 2.3.3.
From your friends at Drone-Hacks. Soon.

Drone-Hacks, the best way to hack your DJI Drone

Drone-Hacks is the most easy and best way to hack your DJI Drone. Depending on your drone you can hack the NFZ, Altitude limit, FCC signal power and much more.

drone-hacks.com

*UPDATE* 7/30/21 "To downgrade from the latest FW you need the empty file named "qiangzi_shengji" on SD card instead of "force_upgrade".

Big thanks to rvl for posting this and Cicero24 for testing and confirmation. See post #151 in this thread.

I have evo 1 and would like to go back to the previous firmware version 1.1.58

lukappaseidue · Aug 9, 2021

Antonello you can try at your own risk

Puoi provare pare funzionare, ma a tuo rischio.
Metti il file vuoto, rinominandolo con il nome cinese (vedi qualche post sopra) e metti un firmware vecchio nella stessa sd

davshev · Aug 9, 2021

lukappaseidue said:
Antonello you can try at your own risk

Puoi provare pare funzionare, ma a tuo rischio.
Metti il file vuoto, rinominandolo con il nome cinese (vedi qualche post sopra) e metti un firmware vecchio nella stessa sd

Qui ci sono i links per il Evo 2. No so se funziona per il Evo 1.

FYI, I was able to rollback firmware V2.7.25 to V2.6.22. As of 8/8/2021 this works. If you want to downgrade, you'll need the downgrade file. See link below. The file is titled "force_upgrade," however it will not allow the downgrade unless you change the file name to qiangzi_shengji.
Drone-Hacks, the best way to hack your DJI Drone - Home

Use the renamed downgrade file along with the firmware version to which you want to downgrade. Choose the firmware version from link below.
Dank Drone Downloader - Web App

rvl · Aug 9, 2021

Antonello said:
I have evo 1 and would like to go back to the previous firmware version 1.1.58

For the latest Evo 1 FW (v1.5.8) the "force_upgrade" file should work.

lukappaseidue · Aug 10, 2021

@rvl
Thank you for your search.
I hope you will be able to find (and activate) force FCC (rf power)

Antonello · Aug 10, 2021

rvl said:
Per l'ultimo FW Evo 1 (v1.5.8) il file "force_upgrade" dovrebbe funzionare.

Hi could I tell me where is the forced update file?

force_upgrade

I downloaded firmware 1.5.7

I want to replace it in place of 1.5.8

davshev · Aug 10, 2021

Antonello said:
Hi could I tell me where is the forced update file?

force_upgrade

I downloaded firmware 1.5.7

I want to replace it in place of 1.5.8

Here is the force_upgrade link. https://drone-hacks.com/release/autel/downgrade.zip

Antonello · Aug 10, 2021

davshev said:
Ecco il link force_upgrade. https://drone-hacks.com/release/autel/downgrade.zip

Thank you very much!

Cicero24 · Aug 12, 2021

Cicero24 said:
I’ll try the one before 2.5.18 out of curiosity tomorrow and report back.

Just rolled back to v2.5.12 and all went well. When I updated back to v2.5.25, I was prompted to register the drone once again. Just throwing that out there for anyone who may be curious. Adios!

PingSpike · Aug 12, 2021

So it IS possible to roll back to a version prior to the "activation" version (v2.5.18)?

Nicely done @Cicero24

Did you use the qiangzi_shengji file name every step of the way, or did you switch to force_upgrade at some point?

davshev · Aug 12, 2021

PingSpike said:
So it IS possible to roll back to a version prior to the "activation" version (v2.5.18)?

Nicely done @Cicero24

Did you use the qiangzi_shengji file name every step of the way, or did you switch to force_upgrade at some point?

I did the rollback a few days ago on Evo II pro. Initially I tried it with the force_upgrade, but it didn't work. Then I changed the file name to qiangzi_shengji and that did the trick.