# Auto Reboot Fix
## V2801F
### Issue
* Invalid `VS_AUTH_KEY`
* Changing MAC Address `ELAN_MAC_ADDR` can cause wrong `VS_AUTH_KEY` value

### Fix
* You need to generate new `VS_AUTH_KEY` when change `ELAN_MAC_ADDR` and `HW_HWVER`
* Apperently, you have few seconds to access Telnet before rebooting
* To prevent auto reboot by entering `echo 3 > /proc/fiber_mode` (XPON Ethernet Mode)

> If you can't type fast enough, use this autoit script `quick_telnet-login.au3`.
>
> Take a look some generated [`VS_AUTH_KEY` here](VS_AUTH_KEY.md)

### Note
When `echo 3 > /proc/fiber_mode` is set, you lose telnet acccess, you need to unplug fiber to get back

## TWCGPON657
* No such problem, `VS_AUTH_KEY` does not exist.