Installing OpenWrt on Archer C2600 v1.1

Just received a refurbished TP-Link Archer C2600 from Newegg and want to flash OpenWrt.
My laptop has Ubuntu 20.04 and is connected directly to LAN1 of the router. What I am doing is the following:

  1. Install tftpd-hpa server
  2. Download openwrt-21.02.1-ipq806x-generic-tplink_c2600-squashfs-factory.bin, rename it to ArcherC2600_1.0_tp_recovery.bin and copy it into /srv/tftp directory (which is specified as TFTP_DIRECTORY in /etc/default/tftpd-hpa )
  3. Set laptop IP to, subnet mask
  4. Test the server:
tftp> get ArcherC2600_1.0_tp_recovery.bin
tftp> quit
  1. Keep reset button on C2600 pushed, power it on, keep reset pushed and wait for ~30 seconds. LEDs are blinking (have no idea what's happening) and then router reboots.

Unfortunately, after this process completes, the router still has the TP-Link factory firmware.
Any ideas?

Here is also output from wireshark. Everything looks normal, but openwrt just won't install..

Switched from Ubuntu to Windows and successfully installed with tftpd64.
Not sure why Ubuntu didn't work though.

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