Cannot send/receive mms anymore with free.fr provider

[yusssufff]

Just follow those steps and see if volte appears:

VoLTE on the Xperia 10 II - filling in the gaps

Oh thanks. So that is: devel-su cd /vendor/oem/modem-config/ mkdir S8683.1 cd S8683.1 echo "mcfg_sw/generic/common/default/vl/global/mcfg_sw.mbn" > modem.conf right? And how would be the “back steps” like if i change provider/simcard, and want now to get back to the previous state? how to “rollback” that operation lets say?