If your model does not support SD cards, you must use the supplied USB to RS-232 or USB-to-USB cable to connect it to a PC, as described in the WS-6933 User Manual .

Without a valid cryptographic key, the patch was useless. But Kael remembered a trick from his navy days: the 6933’s signature check only looked at the first 64 bytes of the file. If he could corrupt those bytes with a known valid header from an older update, the meter would read the rest of the new code.

: Use the manufacturer’s specified update software on your PC. You may need to select the specific .bin file you downloaded and follow the on-screen prompts to "Update" or "Upgrade".

The most critical step is finding the exact software file for your specific hardware revision. Satlink has released several hardware iterations of the WS-6933.