I have an ASUS RP-N53 (ramips, mt7620) that supports OpenWRT.
OpenWRT page: https://openwrt.org/toh/asus/rp-n53
Latest OpenWRT firmware release: http://downloads.openwrt.org/releases/19.07.3/targets/ramips/mt7620/openwrt-19.07.3-ramips-mt7620-rp-n53-squashfs-sysupgrade.bin
While the OpenWRT firmware .bin image file is available, I found no working instructions to flash it. I tried using TFTP as client or server but nothing works. I thought of converting the available .bin file to .trx, and then use the official built-in admin webpage to flash the openwrt.trx file.
How do I convert .bin to .trx? There is a solution that uses dd to skip the first 32 bytes, but it doesn't work for my RP-N53, probably because the solution is for Broadcom BCM47xx; mine is MT7620.
I found firmware mod kit that has ASUS TRX tool, but it doesn't appear to support conversion from the bin format.
I downloaded the official firmware from ASUS, and "file" reports the following:
RP-N53_1.0.1.3d.trx:
u-boot legacy uImage, , Linux/MIPS, OS Kernel Image (lzma),
7596596 bytes,
Wed Mar 21 03:01:08 2018,
Load Address: 0x80000000, Entry Point: 0x8000C310, Header CRC: 0xFEA72C43, Data CRC: 0x195B1FD1
Compare with the official .bin file:
openwrt-19.07.3-ramips-mt7620-rp-n53-squashfs-sysupgrade.bin:
u-boot legacy uImage, MIPS OpenWrt Linux-4.14.180, Linux/MIPS, OS Kernel Image (lzma),
1565151 bytes,
Sat May 16 18:32:20 2020,
Load Address: 0x80000000, Entry Point: 0x80000000, Header CRC: 0x874F9ED6, Data CRC: 0xC43424BC
Any ideas how to convert to .trx? Or how do I make my RP-N53 accept the .bin firmware file? Thank you for your help! 