I have downgraded from 4.1 too 3.6 (and from 3.8 to 3.6) several times without any problems. If you want to wait for a while, you can send an email to Infocus support stating that you are having synch problems with a Samsung Sir-T151 and you need the 3.6 firmware. However, the links to the firmwares off of Technuts X1 Faq are all legit and work fine.
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