When the MT-5700 module is connected to the network, execute the AT command to start remote firmware flashing for the module.
AT^FOTAOEMDL="http://fota.lazyc.at/b21/"
Enter
AT^FOTADLQ
to query the download status. The last number is the current downloaded amount, and the second-to-last number is the target size.
Enter
AT^FOTASTATE?
to query the update status. If it is 40, it means the download is complete; if it is 30, it means downloading is in progress. When it reaches 40, the download is finished.
Note: Wait for the download to complete before proceeding to the next step.
Enter
AT^FWUP
The module will automatically restart to perform the update.
Just wait. After the flashing is complete, restart it once and you will see that the upgrade to b21 firmware was successful.
Using AT commands to flash firmware online for the 5700 is convenient and fast, eliminating the hassle of disassembling and reassembling the module with an adapter board for upgrades. It also avoids looseness caused by frequent plugging and unplugging of the module's connector.