A: No! The “B” and “C” revisions have different display and touch controllers. Flashing the wrong one will cause a black screen or inverted touch.
If your screen is black and the PC doesn't recognize the USB when plugged in: yt9218c firmware update
If your unit is bricked or stuck on boot: A: No
Method A — Official over‑the‑air (OTA) / in-app update (recommended) If your screen is black and the PC
Method B — Manual download from vendor website (when OTA unavailable)
Do not download firmware from untrusted third‑party sites.