I've heard about at least 3 instances when after doing sysupgrade from OpenWRT to LEDE and LEDE to LEDE routers bricked and went into bootloop. They where recoverable though TFTP but still I assume this isn't expected behavior.
I'm just putting the info here trying to get more feedback from other people. Personally I'd like to know how big of an issue is this right now.
Those devices have Atheros wifi radios. Are you flashing a recent build of trunk? If so, try reverting the Airtime Fairness commit of two week ago, https://git.lede-project.org/?p=source.git;a=commit;h=6b013019f9886ee1cda8a48d5b01009527136802
I had reboots on a bcm63xx board with an Atheros AR 9223 wifi radio. Reverting the ATF commit fixed the issue.
Can confirm sysupgrade from openwrt to lede-17.01.0-r3205-59508e3-ar71xx-nand-wndr4300-squashfs-sysupgrade bootloop on WNDR4300. TFTP using factory image fixed.
confirming (see also additional report by xirus):
Factory images are not meant to be used for sysupgrade. You should have used -sysupgrade.bin image.
Tried this with various combinations, also with all available older versions / RCs. Unfortunately with no success. Any idea how I can provide data for bugfixing?
I have TP-Link Archer C7 v1 and have same bootloop with all LEDE versions 17.xx.xx