MIPSBE or SMIPS for HEX Lite RB750r2 router?

RouterOS Beginner Basics
1

What version of RouterOS I must use for HEX Lite RB750r2 router?
I installed MIPSBE main package 6.37.1 but now I think it must be SMIPS, because router began to work unstable.
So, MIPSBE or SMIPS?

2

MIPSBE- for you
SMIPS is only for rb941 (hAP lite)

3

Ok.
Thank You!