ISDT C4 EVO battery charger firmware downgrade

A while ago, I've bought the ISDT C4 EVO USB-C-powered battery charger to replace my MAHA C9000 (of which there seems to be a new "Pro" model available). The ISDT charger gets regular firmware updates which add new features and optimises the charging modes for different battery chemistries. Up until firmware 1.0.44, everything worked fine. Then, in late September 2024, firmware 1.0.46 came along. Suddenly, the charger showed some "Unknown Error 0x400" messages whenever it was discharging a […]

https://blog.mbirth.uk/2025/01/05/isdt-c4-evo-battery-charger-firmware-downgrade.html