If the module is completely unresponsive (no USB enumeration, no LED activity), you have two options:
When Download Successful appears, close the tool and power-cycle the module (disconnect USB for 10 seconds). ml7820 b firmware
You cannot proceed without knowing what is currently installed. If the module is completely unresponsive (no USB
Early revisions of the ML7820 B firmware may have had issues with: Newer firmware addresses these bugs
Newer firmware addresses these bugs.
If your device is deployed in a regulated industry (healthcare, payment systems), auditors may require proof of patched firmware against known vulnerabilities like the "Sierra Wireless ALAS-2020-001".
Before updating, you must know what firmware version is currently running on your module.