I'm trying to update the firmware on Extreme x150, can you tell me what's wrong?

Question

Computer networks

I'm trying to update the firmware on Extreme x150, I get this error, and other similar extremes have been updated normally, ping to extreme goes from it to my computer.
I update via tftp. Tell me what could be wrong? I have already rebooted the piece of iron, I do not have physical access to it (it is located in another city), but there is an assistant on the other side.
artem-ex.8 # download image 10.35.0.10 summitX-15.3.5.2.xos vr "VR-Default" secondary
Do you want to install image after downloading? (y - yes, n - no, - cancel) Yes
Downloading to Switch.....Error: Failed to download image - tftp: recvfrom: Resource temporarily unavailable
artem-ex.8 #
artem-ex.8 # ping 10.35. 0.10
Ping(ICMP) 10.35.0.10: 4 packets, 8 data bytes, interval 1 second(s).
16 bytes from 10.35.0.10: icmp_seq=0 ttl=124 time=6.941 ms 16
bytes from 10.35.0.10: icmp_seq=1 ttl=124 time=39 ms
ms
16 bytes from 10.35.0.10: icmp_seq=3 ttl=124 time=7.624 ms
--- 10.35.0.10 ping statistics ---
4 packets transmitted, 4 received, 0% loss
round-trip min/avg/max = 6/ 15/39 ms
artem-ex.9 #

Answer 1

Does this happen on every startup?
UDP, specifically port 69, isn't filtered anywhere along the way?