setting modes back to default on Quectel EC 25 modem won't work

[Enrico Mioso]

Hello again!

to update my question, I report here that:

qmicli -p -d /dev/cdc-wdm0 --nas-get-system-selection-preference
[/dev/cdc-wdm0] Successfully got system selection preference
         Emergency mode: 'no'
         Mode preference: 'gsm, umts, lte'
         Band preference: 'gsm-dcs-1800, gsm-900-extended, gsm-900-primary, wcdma-2100, wcdma-850-us, wcdma-900'
         LTE band preference: '1, 3, 5, 7, 8, 20, 38, 40, 41'
         TD-SCDMA band preference: '(NULL)'
         Roaming preference: 'any'
         Network selection preference: 'automatic'
         Service domain preference: 'cs-ps'
         GSM/WCDMA acquisition order preference: 'wcdma'
         Acquisition order preference: umts, lte, gsm, td-scdma, cdma-1x, cdma-1xevdo

Is there something looking "peculiar"?
thank you very much again to all,

Enrico