6S board 100% not work in SE.... Is totally another board.... And new SE board you can buy on aliexpres... But buy with homebutton, when you not have originál button, not working after
Try connect with USB-C/OTG reduction some mouse.... Try backup your data first on memory card... After hard reset can help.... Maybe.... But data you can
You can put another battery or charge your battery in another phone... When you buy new battery, all time is precharged on cca 40-60% you can take your data.... Or buy “Universal Lion charger" 8euro Amazon...
Nand Chip problem.... The memory.... When yo open your phone And heating like 2minit on 200celsius the Chip, after you can start normal And také the data out..... This fix is for max 2days.... Oficial solution is reball.... But not possible in home
I think your phone not have IMEI now.... Check on Activision screen symbol “I “ ….. When you not see the IMEI is baseband problém... Without IMEI not possible ” ” ”