Also this is what I was getting when inspecting the mavlink server.

00:19:39.969721 IP 192.168.1.1. domain > 192.168.1.134. 40850: 5282 Refused 0/0/0 (42)
00:19:39.970315 IP 192.168.1.134.48451 > 192.168.1.1. domain: 5282+ PTR? 1.1.168.192. in-addr
• arpa. (42)
00: 19:39.973637 IP 192.168.1.1. domain > 192.168.1.134.48451: 5282 Refused 0/0/0 (42)
00:19:40. 106351 IP 192.168.1.138.14550 > 192.168.1.134.14550: UDP, length 21
00:19:41. 068099 IP 192.168.1.138.14550 > 192.168.1.134.14550: UDP, length 21
00:19:41.553204 ARP, Request who-has 192.168.1.1 tell 192.168.1.134, length 28
00:19:41.553488 ARP, Request who-has 192.168.1.138 tell 192.168.1.134, length 28
00:19:41.558414 ARP, Reply 192.168.1.1 is-at 80:69:1a:06:84:4e (oui Unknown), length 28
00:19:41.561634 ARP, Reply 192.168.1.138 is-at 34:c9:3d:07:16:8d (oui Unknown), length 28
00:19:42. 065376 IP 192.168.1.138.14550 > 192.168.1.134.14550: UDP, length 21
00:19:43.070712 IP 192.168.1.138.14550 > 192.168.1.134.14550: UDP, Length 21
00:19:44.075718 IP 192.168.1.138.14550 > 192.168.1.134.14550: UDP, length 21
00:19:45. 064630
IP 192.168.1.138.14550 > 192.168.1.134.14550: UDP, length 21
00:19:46.062935 IP 192.168.1.138.14550 > 192.168.1.134.14550: UDP, Length 21
00: 19:47. 107960 IP 192.168.1.138.14550 > 192.168.1.134.14550: UDP, length 21

@Eric-Katzfey I fixed the problem thanks after I download the Seeker's parameter at gitlab it success arm by my RC and It can fly now

@Nicolas-Ethan-Blanchard I also re-loaded PX4 parameters from the provided file in the GitLab, so that could have helped as well. Although, I do think that the IMU orientation parameter was set correctly initially, because it matched the parameter in the working drone.