I'm trying to migrate from a 9124 to 9148 and it's mentioned in the procedure that for this to be done both switches must be at the same Firmware level, I want to keep the old version (4.2(1a)) on the new switch (which came to me shipped with 5.0(1a)), cannot find the 4.2(1a) version for the 9148, can I use the same file that I installed on the 9124 to install it on the 9148 or do I HAVE TO upgrade the 9124 prior migration to 5.0(1a) to match the new switch's level?
Appreciated