XTEINK X4 E-Book Reader (Developer Edition), 4.3" Pocket E-Ink eReader, Physical Page-Turn Buttons, Ultra-Thin 0.23" & 2.72 oz, Magnetic-Ready Design, Distraction-Free Reading, 16GB, Space Black

I just bought my X4 directly from Xteink and they sell the unlocked developer version. Amazon is also selling the developer version as well. Putting community made operating systems is easier than the locked version. Xteink currently has a sale for their devices while Amazon isn’t. https://www.xteink.com/products/xteink-x4?gad_source=1&gad_campaignid=23855965894&gclid=CjwKCAjwuuPRBhAnEiwA2Ji8elCN1K2PvoTH24ZS-fqBqbeIoPDWAoCvWXZ3lWVeS-pqOQMFEp78QhoCMjQQAvD_BwE https://a.co/d/0boHtiZI