The WS6906 only reads FAT32-formatted microSD cards. Cards larger than 32GB may not work.
Flashing firmware from a different hardware revision can cause the "Lock" light to stay permanently lit, making the meter unusable for scanning.
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This is the most crucial, yet most overlooked step. Before attempting any upgrade, you create a backup of your current firmware and satellite data. The eBay review contains this vital warning: "There are 2 versions... After an upgrade your newer Satlink model will be Locked always without receiving any Scan signal... So set your PC Firmware update program on 'DataDump'/Backup Data First!!" .
Before you begin the process, ensure you have the following items ready: The WS6906 only reads FAT32-formatted microSD cards
Required if your computer lacks a native 9-pin serial COM port (most modern PCs).
This happens if the firmware file used was corrupt or belonged to a different model revision. This public link is valid for 7 days
This is not a "plug-and-play" USB update. It requires a specific RS-232 to USB cable and the SatlinkTools PC program. Turning off the device during the 1-minute flash process can permanently brick it.