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Add laptop-as-TFTP-server and XMODEM console upgrade methods

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- Method 3: laptop with console + Ethernet can act as temporary TFTP server
- Method 4: XMODEM over console cable when USB broken and no Ethernet available
- Note 3-hour transfer time warning for XMODEM at 9600 baud

https://claude.ai/code/session_01JR2EMK7rwrZJowpstcaxQ6
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Claude
2026-03-24 04:07:26 +00:00
parent b77f6fd19b
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README.md
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@@ -544,18 +544,49 @@ The switch reboots after the agent upgrade.
---
### Method 3 — TFTP (requires TFTP server on management computer)
### Method 3 — TFTP from a laptop (no dedicated server needed)
Install a TFTP server (`sudo apt install tftpd-hpa`), place the firmware files in `/srv/tftp/`, then from enable mode:
Your laptop can act as a temporary TFTP server. Plug both the console cable **and** an Ethernet cable from the laptop into the switch at the same time.
On the laptop:
```bash
sudo apt install tftpd-hpa
sudo cp ers5900diag_*.bin ers5900_*.img /srv/tftp/
sudo ip addr add 192.168.1.50/24 dev eth0
sudo systemctl start tftpd-hpa
```
copy tftp address 192.168.99.50 filename ers5900diag_7x_x_x_x.bin
Then on the switch via console:
```
enable
copy tftp address 192.168.1.50 filename ers5900diag_7x_x_x_x.bin
```
Then:
```
copy tftp address 192.168.99.50 filename ers5900_7x_x_x_x.img
copy tftp address 192.168.1.50 filename ers5900_7x_x_x_x.img
```
Stop the server when done:
```bash
sudo systemctl stop tftpd-hpa
```
---
### Method 4 — XMODEM over console cable (last resort, no network required)
If the USB port is broken and you have no Ethernet available at all, boot menu option 4 ("Download Agent/Diag") supports XMODEM file transfer directly over the serial console cable. No network required.
**Warning:** At 9600 baud, a 10 MB firmware file takes approximately 3 hours. Only use this if nothing else is possible.
In `screen`, after selecting option 4 from the boot menu, send the file with:
```
Ctrl-A then :exec !! sx -b /path/to/ers5900_7x_x_x_x.img
```
(`sx` is part of the `lrzsz` package: `sudo apt install lrzsz`)
---
## Troubleshooting