Radicom Research RB8762CMF Series Designer's Manual page 21

Step 7. Click "Select File" from APP. Click "UPLOAD".
Step 8. The firmware upgrade will start immediately. Once the screen shows "Update Success!"
means firmware upgrade successfully.
Step 9. When new firmware upgraded successfully through OTA, you must return
RB8762CMF-MB to its original mode (master/slave). Issue "at+role0<CR><LF>" to enter
slave mode and "at+role1<CR><LF>" to enter master mode.
RB8762CMF Designer's Guide (RRD2Z50-20180802001-A07-C3) 21