Mars 4 Ultra Firmware

[okroj-it]

I've used the Gktwo firmware from here to add dropbear to the official Mars 4 Ultra firmware, changed the root password hash, rebuilt and flashed onto my Mars 4 Ultra. SSH works like a charm.
username: root
password: ultra

 ✘  ~  ssh root@10.10.50.164
root@10.10.50.164's password:
~: ip a
1: lo: <LOOPBACK> mtu 65536 qdisc noop qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000
    link/ether 66:66:68:43:22:54 brd ff:ff:ff:ff:ff:ff
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq qlen 1000
    link/ether bc:fd:0c:6f:a8:19 brd ff:ff:ff:ff:ff:ff
    inet 10.10.50.164/24 brd 10.10.50.255 scope global wlan0
       valid_lft forever preferred_lft forever
~: uname -a
Linux (none) 4.9.84 #17 SMP PREEMPT Fri Dec 22 18:21:02 CST 2023 armv7l GNU/Linux
~: scp
usage: scp [-1246BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]
           [-l limit] [-P port] [-S program]
           [[user@]host1:]file1 [...] [[user@]host2:]file2
~:

File is too big to upload here:
https://drive.google.com/file/d/1ZLsJniHVi_udM_RPsz5LhRWtBB0NhWC_/view?usp=sharing