Originally Posted by Wildey1771
I reflashed my S5 with a stock rom to remove all the Carrier blocks and extras. After the flash the device booted up and instantly came up with the error saying acore has stopped working and then around around 5-10 seconds the phone reboots and does it again. What can I do?
It's hard to answer since you provided no crucial details about your phone, configuration or how you flashed it.
You didn't tell us which S5 model you have or your carrier. Nor what firmware file you flashed, so we don't know if it was a compatible file. No Odin log, so we don't know if the flash had errors or not. And you didn't describe how you flashed step by step so we don't know if you missed essential steps.
At a guess, try wiping the partition cache from recovery mode. Then if necessary, do a factory data reset as well (will delete user files!). If you have ongoing problems, then you should restore your backup and try again from that stable condition.
No backup? That is a bad habit to say the least. In that case, flash a full stock firmware image that matches the carrier that the phone was originally sold for.