No specialized hardware (like a programmer) is required if the USB boot method works.
While finding a single dedicated review for the ONIDA LCO22VMO USB firmware Download ONIDA LCO22VMO Firmware USB rar
Expert walkthroughs on YouTube suggest a consistent methodology for using these USB-based firmware files: No specialized hardware (like a programmer) is required
You must extract the .rar file on a PC and move the internal .bin file to the root directory of a FAT32 formatted USB drive (ideally 4GB or 8GB). matching the model
The firmware is generally considered stable once installed, but users emphasize that using the wrong version (e.g., matching the model