Pull it down for parts if you don't want to go through the pain of chip replacement with reballing. Too easy to cock that up. A doodle for someone like Alexander2010 of course. You have a good screen, battery and case i assume or you wouldn't be so concerned that it's died. You may be able to pick a 465 up on ebay with a smashed screen cheap.

Also, nuvi 255/265W HWID 0827 can be converted to 465 and will perform just like an original 465. I have a 255W>465 [no BT of course] and I converted a 265W to 465 for my son who has used it daily for business deliveries for nearly a year a year without problems, even though it's considered a risky conversion by some ppl [Yours Truly was among them and will be again if one of those converted units dies].

255W and 265W are quite cheap in the States, just make sure it's not the MTK chip HWID 1091.