Download sysupgrade image, openwrt-21.02.0-mvebu-cortexa9-linksys_wrt1900acs-squashfs-sysupgrade.bin from [[https://openwrt.org/toh/linksys/wrt1900acs|Linksys WRT1900acs page]]. SHA256: 3880d91cdc54e1cb88cdb3123244d5cf85b8a05d64b4206fb0bd6462a6c73f49
In LuCi interface, go to "Backup / Flash Firmware" page and upload file in the "Flash new Firmware Image" box.
Get the warning.
"Device linksys,shelby not supported by this image Supported devices: linksys,wrt1900acs armada-385-linksys-shelby linksys,shelby - Image version mismatch: image 1.1, device 1.0. Please wipe config during upgrade (force required) or reinstall. Reason: Config cannot be migrated from swconfig to DSA Image check failed.
The uploaded image file does not contain a supported format. Make sure that you choose the generic image format for your platform."
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I have found information about this warning on the [[https://openwrt.org/releases/21.02/notes-21.02.0|release notes for 21.02.0]]. So would the best course of action be to do a fresh install of 21.02.0 and set up my configuration again from scratch?