You updated, but now Wi-Fi is greyed out. This is a "persist partition" mismatch. You need to re-flash the persist image. This requires root access and ADB commands ( dd if=/sdcard/persist.img of=/dev/block/by-name/persist ).
However, is the soul of these units. Below is everything you need to know. uis7862 firmware
: On many newer versions (specifically after May 2023), once you update to a certain firmware version, you cannot revert to an older one. Common Troubleshooting Potential Solution "Start Update" not showing You updated, but now Wi-Fi is greyed out