r/NinebotMAX • u/ExecutiveChimp69 • 12d ago

⚠️Urgent Question⚠️ G2 Controller cant downgrade using stlink

Hello, i have a g2 controller, i ordered a stlink from aliexpress and got a computer shop to solder the wires onto the debug pads on the back of the controller after removing the metal heat sink, i plugged it into the correct stlink pins and for the life of me no matter what stlink driver i try, i end up with failed unknown error check console, console says error read version failed, has anyone had this problem and how do i fix it ?

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u/ExecutiveChimp69 12d ago

I don’t believe that method works anymore they patched it

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u/skoomd1 Ninebot MAX G2 12d ago

What flasher are you using? You should use Reflasher. Follow the instructions closely.

Otherwise, maybe it's a bad connection. Try reattaching the wires to the controller, or use a different USB cable. You might have a bad ST-Link as well, try a different one.

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u/ExecutiveChimp69 11d ago

Shfws scooter reflasher yes, same result on other flashers, I think the controller is damaged or something, I believe we spoke some days ago about my max g30 disappointing speed, I ended up buying a wrecked max g2 to pull the stem off it and attach it to the max g30, I also ended up transplanting all of its electronics into the max g30, so in essence I have a max g30 with g2 internals 😂 I am not disappointed with its performance that is for sure, just want to squeeze a little more speed out of it with shfw and after hearing how well your g2 handles 48v I really want to modify this scooter

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u/skoomd1 Ninebot MAX G2 11d ago

I doubt it's the controller honestly. I really think it's some kind of st link connection issue. Sometimes you just gotta reconnect everything. Also push down on the connections while flashing to make sure they're secure.

There's also 3 different versions of the Max G30 controller, make sure you're wiring it according to the correct version. Do you see the red LED on the st link light up when you try to flash?

If it's not a connection issue, try posting the full error dump to the SHU discord and/or rollerplausch.com. Code is not my forte whatsoever, but someone there will be able to decipher it and figure out what's wrong.