Q2686H latest Firmware

I have some trouble with a Q2686H, what is the last firmware revision that will work with this legacy CPU ?
With v7.52 I get an insufficient RAM error in Dev Studio , v7.51 has the 256k option but is very unstable.

Can someone tell me a known good firmware revision ?

Kind regards

The latest FW is R7.47.6, release note: https://forum.sierrawireless.com/t/open-at-application-framework-2-37-6/6106/1.

Hope it helps.

Thanks! I got it working with this version.