433ah serial error

RouterOS Wireless Networking
1

hey all
when i am upgrade to 4.3 beta to tested it i’m upgrade the sn and every thing is ok
but when i’m downgrade the router os to 3.25 then the router borad needed a new sn and the sn become beta and the board will die after 24h
how i can upgrde my system without this problem
best regareds

my borad data



Board type: 433AH
Serial number: 1AA701E0267C
Firmware version: 2.19
CPU frequency: 680 MHz
Memory size: 128 MB
eth1 MAC address: 00:0C:42:3D:7E:CB
eth2 MAC address: 00:0C:42:3D:7E:CC
eth3 MAC address: 00:0C:42:3D:7E:CD

2

old versions have different SoftID, so they need different key. When you upgraded, the old key was stored in a file. Type the command “/system license import=” to get it back