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I've just upgraded my firmware to build 10.5.1.A.0.292 on a SGP312 (wifi Tablet Z). I'm in the UK. The Update Centre told me about it and I've completed the upgrade via PC Companion this morning. no noticable difference as yet.
Updated my SGP312 to 0.292 a couple of days ago and have found wifi connectivity (2.4ghz) fails when Bluetooth enabled. There was a previous throughput problem with concurrent wifi and Bluetooth which seems to have become much worse - having hoped it would be resolved with the update.
Poor show Sony for a 'certified' update.
Bluetooth works fine with wifi. I've never had the problem with any version of firmware. Running a bluetooth keyboard and mouse currently