Quick question looking for a short answer, please. Is it a problem if the f5121 is provider branded (Telekom logo at boot up) but simlock free? I have a 180€ mint condition used offer i would like to accept or decline in the next hour. So, will i be able to flash a Telekom branded Xperia X? Thanks in advance!
from https://developer.sonymobile.com/unlockbootloader/ In your device, open the dialler and enter *#*#7378423#*#* to access the service menu. Tap Service info > Configuration > Rooting Status. If Bootloader unlock allowed says Yes, then you can continue with the next step. If it says No, or if the status is missing, your device cannot be unlocked.