Just a hint. LTWOO doesn't have official account on Aliexpress. LTwoo official store it's only a name of the reseller store

Ohhhhhhhhhh lol.  Well. Either why they did pretty good.

New to the forum.  I have a 1st gen LTWOO eRX on an ELVES frame that I built up.  It's been FLAWLESS for about 1000 miles at this point to include a 90-mile ride and a 105-mile ride.  I went to wash it and avoided water on the derailleur....   DEAD.  It flashes red lights when you attempt to operate the shifter and does not do anything.

The good:
1.  I got it from LTWOO's official account on Aliexpress and they are pretty good at helping.  They did ask for a video to confirm and sent it to a tech.  By the next day, they had already agreed to send me a new unit.
2.  Based on the photo they sent me, it looks like they are sending the most up-to-date rear derailleur.  Hopefully, there isn't any issues with compatibility. 

The inconvenient:
1.  I had to pay for shipping, which I was prepared to do.... But I wasn't expecting it to be $65.  I was thinking around $20.
2.  Time difference is a factor in how long the process takes.  Obviously, they are in a different time zone, so it took about 5 days of talking to get it all sorted.