[Q] Is downgrading possible?

Greetings to whoever is reading this!

I recently got a HTC HD2 phone with JellyBean 4.2 or 4.3 installed, I'm not sure. But I've been having memory problems with the phone. Whenever I install too many apps, the internal memory of the phone goes low and I can't install anything. I used Link2SD to transfer the apps to the SD card (and yes, I partioned it correctly I think) but I still get the memory low warning.

My question is: Is it possible to downgrade from JellyBean to Android 2.3 version?
I think I screwed up a little, because while having the JellyBean still installed, I installed something else over it trying to downgrade. But that's not causing any problems so far.

I'm quite a noob when it comes to android so please bear with me. Is it possible to delete everything that is installed on this phone, and start installing Android 2.3 from the beginning? If yes, then can you please tell me step-by-step how it is done, or if there is any guide that I missed, can you point me to it?

Thank you very much!

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