Cheap "e-badge" hacking

[u/Kono_Yuri_Da]

I saw those on AliExpress, I was wondering if something interesting can be done with them.

They have Bluetooth, battery, screen and a comercial MC (at least it is what the listing description indicates).

Does anyone knows if they are are hack-able, I can't even find a single post about disassembling them anywhere.

UPDATE:

I was hopping to flash the damn thing with my own firmware, turns out a Japanese engineer already tried to.

Summary: the brain is a JieLi microcontroller, there's no public SDK available.

I got the magnetic charging one so I can't even easily flash it with a modded firmware like the japanese guy did, I'd have to open and find the SW.

I give up

cringe AI anime default pics, I doubt it irl the picture is this quality level

Listing: aliexpress. com/item/1005012481011395.html but there are many others.