If your device is running, you can query the eMMC firmware version via ADB (Android Debug Bridge) or a terminal on a Linux system:
: Carefully "reball" and solder the 254 tiny pins onto the motherboard. Km2v8001cm-b707 Firmware
Here is an analysis of the potential identity of this device and a general narrative story regarding its firmware. If your device is running, you can query
Always use an anti-static mat when handling BGA components. Where to Find Reliable Files If your device is running