Hi luis, I bought a used MX Anywhere 3 which middle clicks turned out to be unreliable. So I opened it, removed its battery and scrollwheel unit and also tried to fix it with dielectric cleaner. After letting it dry for a moment, I carefully reassembled everything. But just like yours, it not longer works and just flashes red. It seems like a bootloop to me, but I couldn't find any documentation on how to reset its memory or reinstall its firmware without wireless connection. Does this mean, end users are not supposed to disconnect its battery? But how would I clean or replace the switches then?