OpenWrt 21.02.0 Fourth release candidate

[tmomas]

@eehmke

Device linksys,rango not supported by this image

Please wipe config during upgrade (force required) or reinstall. Reason: Config cannot be migrated from swconfig to DSA Image check failed.

See

• Linksys WRT3200ACM & 21.02.0-RC1 popup message - #2 by slh
• Device not supported (wrt3200acm rango) snapshot install - #2 by hnyman