The flash image was uploaded. Below is the checksum and file size listed, compare them with the original file to ensure data integrity.
Click "Proceed" below to start the flash procedure.
Keep settings and retain the current configuration
Device wndr4300 not supported by this image Supported devices: netgear,wndr4300 Invalid sysupgrade file. 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.
Force upgrade
Select 'Force upgrade' to flash the image even if the image format check fails. Use only if you are sure that the firmware is correct and meant for your device!
force upgrade, now brick,why?
how to recovery? now power led blink at 1hz, from amber to green slow blink.
Keeping settings can cause issues across major version upgrades in general and may be completely incompatible for devices that have transitioned to dsa
Download, read instructions, and use nmrpflash to reinstall Netgear firmware. You need npcap too, and check that your firewall allows nmrpflash. https://github.com/jclehner/nmrpflash
Within netgear GUI, flash the openwrt factory image.
I manage a netgear 3700v4 which is a close model of the 4300. I had issues with it while upgrading from 19.07 to 21.02. It was solved by the method I described. Once 21.02 is flashed, you can safely use upgrading to the next releases.