Dear Silvia,
thank you for the SW.
No, I did not use -e option.
Do you thing I can use this procedure on RM520N-GL to get back serial connexion & install the last FW :
I bricked RM500Q-GL with ATS command so Windows 10 no longer sees USB; is there a way to flash firmware? - IoT Modules / 5G Module - Quectel Forums ?
thanks again