Downgrade issues from high DRV version

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Lothean
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Downgrade issues from high DRV version

Postby Lothean Sun Apr 14, 2019 8:17 pm

Hi,

Recently, an issue with downgrades from Chinese boards appeared.
It would seem that some scooters with a high DRV version, usually 2.x, can't be downgraded back to OFW.

If it happened to you, could you please write down what happened, what did you try, which model of scooter you have and which DRV version was on it? And more importantly, did you succeed in the end ?

Thanks to all of the people who can give information, it might help in finding a solution ;)
zekits
Posts: 1
Joined: Fri Apr 12, 2019 4:17 pm

Re: Downgrade issues from high DRV version

Postby zekits Mon Apr 15, 2019 9:21 am

Hello
I got that issue too, the sollution is to disconnect the board from internal battery, connect it again and flash the cfw.
WWA41
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Joined: Sat Apr 13, 2019 9:42 am

Re: Downgrade issues from high DRV version

Postby WWA41 Wed Apr 17, 2019 12:23 pm

Does not work in case of Error 7 (chunk error)
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Lothean
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Re: Downgrade issues from high DRV version

Postby Lothean Wed Apr 17, 2019 6:55 pm

Does not work in case of Error 7 (chunk error)
Could you please explain more what you mean?
mio
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Joined: Mon Apr 22, 2019 8:51 pm

Re: Downgrade issues from high DRV version

Postby mio Mon Apr 22, 2019 8:54 pm

Hi all

I have the same problem. I can't update the DRV after Esmax. Error 7 (chunk error)
mihan65
Posts: 17
Joined: Fri Apr 05, 2019 9:57 am

Re: Downgrade issues from high DRV version

Postby mihan65 Tue Apr 23, 2019 1:25 pm

Hi all

I have the same problem. I can't update the DRV after Esmax. Error 7 (chunk error)
connect another internal battery, this should work
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Lothean
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Re: Downgrade issues from high DRV version

Postby Lothean Fri Apr 26, 2019 6:28 pm

Hello,
If you get that famous error 7 because of ESMax, connect to your scooter using ES Rollback and select Main controller and 1.3.3
Click on next and generate the bin file
that "recovery.bin" can then be flashed to the main board using ST Link and will unbrick your scooter

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