| Error Message | Solution | | :--- | :--- | | | Reinstall VCOM drivers. Try a different USB port (USB 2.0 preferred). | | S_BROM_DOWNLOAD_DA_FAIL | The firmware link you used is for a different chipset. Find a different Firmware ZTE Blade A55 link . | | PMT changed for the ROM | In SP Flash Tool, go to Options > General > Tick “Download without checksum”. | | Phone still boot loops after flash | You need to select “Format All + Download”, but note this requires backing up NVRAM (IMEI). |

A: Legitimate firmware includes system, vendor, userdata, and boot images. Any file smaller than 800MB is likely just an OTA update, not full firmware.