For me inserting a SIM of a particular carrier did not wipe the phone but did install their bloatware on reboot.
Though, using adb to manually remove (actually remove not disable) all that bloatware plus DT Ignite did the trick. I have even rebooted my device and the bloatware did not return.
Wait, inserting the SIM card WIPED the phone!? That’s insane!
For me inserting a SIM of a particular carrier did not wipe the phone but did install their bloatware on reboot.
Though, using adb to manually remove (actually remove not disable) all that bloatware plus DT Ignite did the trick. I have even rebooted my device and the bloatware did not return.