That is the situation:
I have configured a SNOM D715 with the latest Firmware 22.214.171.124 (see screenshot below):
Then I integrated it to a vodia server hosted by a vm in VMWare Wokstation.
Since the firmware is returned in version 126.96.36.199 and I can not go back to the firmware 188.8.131.52 (D715).
Of course, I put the phone back in its factory default several times (# for 15 seconds during the reboot) without any result.
I will try to load via USB, then if it does not work, I would try to reload the version 184.108.40.206 before trying to load the firmware 220.127.116.11 (D715).
What can I do more knowing that it is quite urgent.
thank you in advance
I'm glad you managed to upgrade again via TFTP.