If the box is dead (red light only), use a CH341A or similar SPI programmer to flash the 8MB chip directly.
Flash this at your own risk. Ensure your power supply is stable during the process to avoid permanent bricking. Download Dump Original Geant HD90 zip
Here is the forum-style post for the firmware dump. Subject: [Download] Geant GN-HD90 Original Firmware Dump (ZIP) Hello everyone, If the box is dead (red light only),
Recovery, SPI Flasher programming, or RS232 restoration. Download Link: [INSERT YOUR DOWNLOAD URL HERE] Installation Note: Here is the forum-style post for the firmware dump
Use the official Geant Upgrade Tool to flash the bin file via a Null Modem cable.
If the box is still responsive, rename the file to G_MS-90.bin (if required by your loader) and update via the menu.
This is the raw flash memory dump (.bin) compressed into a .zip file, ready for technical recovery. Model: Geant GN-HD90 Format: ZIP (containing .bin file) Type: Original Factory Dump