Reply To: Latest Beta Firmwares for DSL-AC51 to DSL-N66U incl. DSL-AC750 Latest DSL ASUSWRT firmware v9.1.2.3_502-g2bdb05b now available. (latest firmware’s are at end of threads) For following ASUS DSL Modem Routers: DSL-AC51 DSL-AC52U DSL-AC55U DSL-AC56U DSL-AC750 DSL-N10-C1 – (extended beta support…

[sam]

i tried to flash and again on DSL-N55U-C1

and still Error message:  Invalid firmware, now rebooting

but i downloaded Rescue_2000 (firmware restoration tool)

then i rebooted the router to recovery mode (holding the reset button while  switching on the router)

and configured the network TCP/IPv4  manually to (IP address: 192.168.1.10 – subnet mask: 255.255.255.0

and flashed the firmware from restoration tool

i done it with hope to not break the router if the firmware Invalid

but it worked fine 2021_06_10_v9.1.2.3_946-gbd5b43b

i still don’t know why this happened but maybe  v9.1.2.3_925 firmware causing this

hope this could help if some one have the same issue

many thanks

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