Gonk, the AVS forum does have an Onkyo firmware update page and has the latest FW and DSP updates on the first page.

The main FW is 1.4 and it is somewhat easy to do. Yes, the 990 was easy to update the FW, but I thought the Onkyo was actually a little easier as long as you have a PC or laptop with a RS 232 plug OR you have a USB/RS232 cable (I bought one from monoprice).

The DSP update is very simple. Burn the image to a CD and hook up a optical cable from your CD (or DVD) player to Optical #1 on the 886 and play it.
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Panasonic TC-P65S1 65" Plasma HDTV, Marantz AV 8801 Preamp, Outlaw 7700 Amp, Klipsch RF7 (X-over dean G modded) RC7 (X-over Dean G modded) RS7 CDT-5800C speakers, Outlaw LFM1 EX Subwoofer, Oppo BDP-93, B & O Turntable, Toshiba HD-A2, Sony CD & DVD 400 disc jukeboxes, DirecTV HD-DVR, PS2, PS3, Wii, Harmony one remote, Monster PowerBar 1200 for the TV, sub, PS3, HD DVD and Wii, Tripp Lite Isolation Bar for the Amp, Pre-Amp and other sources.