- Sun Mar 07, 2021 12:46 pm
So, the special sauce for my situation was to *plug in the charging cable after completing all the steps*. That seemed to reset the scooter and turn on the dash. Nothing else was wrong.
As for the BMS - if your firmware is red you didn't flash it. Mine is blue, and version 134. I was getting a few seconds of ride time then I'd get a Error 21 and it would shut itself off. I checked on IAP and sure as shit, my firmware was still somehow a red, rental version. No clue why, certain I successfully flashed it the first time. I tried reflashing as I describe below and next time I hooked everything up, it was correctly 134.
You don't need to screw everything back together to check you did it right. Just connect all the components, plug the charging cable in and let it reset. If it's not all blue on IAP, break it down and retry.
US did a great job with his tutorial, but I'm going to try to collect here as many things as I found missing in the end.
1. Getting the 'cancerous blob of plastic off'. There's lots of occluded screws, with complicated sockets. Trying to unscrew the blob is tricky, time consuming, and nothing connected is necessary in the end. The head post of the scooter ultimately has 4 screws that hold everything to it. They're the same 4 screws that hold your faceplate down. Take a drill, just go straight through the blob down to the screws (careful not to strip the socket with your drill, unscrew the hex screws and the whole blob comes off - You might want to rip loose the 5-pin julet cable that attaches to the board however. It makes checking the pinouts when you swap the connectors easier.
2. Flashing the BMS - YOU MUST FIRST REMOVE THE LARGE MULTIPIN CONNNECTOR. It then needs to remain unconnected for some time. Probably to allow a cap to run down. For max efficiency I'd say do full diassembly FIRST, THEN start flashing components, starting with the ESC, then BMS, then Dash. Save the dash for last it's the only thing you spent money on. After the BMS has discharged it will flash fine. If you're having trouble loading the full program and memory data, just upload each tab one by one. I had better success that way.
3. MAKE SURE YOU PRESS THE RESET BUTTON ON THE BMS AFTER FLASHING. You can push it through the grey potting, if you're willing to feel around, or just cut it out, the button is under the potting on the same side as the flashing through holes. This will make the blue LED flash. Obviously, also need to reconnect the multipin connector first.
4. CONNECT THE SCOOTER TO MAINS POWER VIA THE 120V CHARGER AFTER REASSEMBLY. This resets the scooter and lets you into its brain to make your modifications as in the last step in the original post. And again, I can confirm that BLE555 is not necessaery, I used the Bluetooth Low Energy firmware 110 and once I plugged the scooter in it ran fine. The necessary cord is pretty standard with most electronics, if you have a laptop, very likely the plug from the wall to your AC/DC wart will serve.