Good job on emailing the PC shop, if they confirmed that it will ship with update BIOS then go for it and do not change anything, if they didnt help much, ask them if they this shop is local if you can pass by and they update the motherboard for you using any compatible CPU lying around there shop, its ok good computer shops will do that free of charge you just ask.
If the above was a no go, then you have 2 choices:
1) Change your APU Choice to a Trinity based one and not an Richland one the trinity equivalent of your CPU in trinity is this :
http://www.newegg.com/Product/Product.aspx?Item=N82E16819113281
2) Or purchase an ASUS motherboard that supports USB BIOS flashback for more info on that watch :
http://www.youtube.com/watch?v=ADcdnwMjd_I
And with the above motherboard with that feature you can update the BIOS without a CPU in mobo, thus you can stay with your current richland CPU.
Hope this helps.