Some mt5510i models have a “bootloader mode” accessible by shorting two pins on the PCB. Contact the manufacturer for a recovery image. In worst cases, you may need to replace the flash chip.
Strings like this are sometimes used in: Tp.mt5510i.pb801 Software Download
Used for general updates or changing screen resolutions (e.g., from HD to Full HD). Some mt5510i models have a “bootloader mode” accessible
Downloading and installing the Tp.mt5510i.pb801 software is a straightforward process. Here's a step-by-step guide: Tp.mt5510i.pb801 Software Download