I was just looking at this, and it looks like the Fiasco image for PR1.3.1 is here: http://nds2.fds-fire.nokia.com/fdp/i...ED_MR0_ARM.bin

It looks like for the eMMC image you just use the latest Vanilla version which is this one: RX-51_2009SE_10.2010.13-2.VANILLA_PR_EMMC_MR0_ARM.bin

The eMMC image is in the tablets-dev mirror like thedead1440 said.

And yeah, the PR1.3.1 update was only offered as an OTA (Over The Air) update like he also said. But I like the idea of just having a file to be able to archive and use manually without relying on any repositories.

I've been thinking about installing CSSU myself.