till now i have everything messed up , blown the old 4.2.2 board while installing sherpa micro
so to fix and upgrade this printer i am gona do following upgrade
BTT SKR Mini E3 V3.0 → NEEDED ( old board is dead)
Sherpa Micro Extruder
Custom cut Glass Bed → Free, so why not?
Bed Springs
Klackender
Belted Z
klipper(later after getting some money)
dual fan