How to upgrade Firmware for Nokia 8310 and 6510? - (now unsupported?)

Hi,
We use a Nokia 8310 and a Nokia 6510. They're old, but we like 'em!

However they both suffer from a firmware bug where the phone crase and
reboots, usually when you're about to send a text. Now if this was a
few years ago then we could just have the latest firmware added at a
nokia service centre, but the ones I've called have deleted their
files, and can't even tell me what the latest formware version are.

My 8310 has v5.11 (27/5/2)
(I've actually just bought a 'new boxed' 6510 off ebay to replace my
wife's current 6510, so I don't know yet what version the new 6510
has.)

Anyone know how I can upgrade the firmwares / do it myself?
Or know what the latest versions are?
(Are they the same file for these two models?)

Thanks in advance,
Dz

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[email protected] declared for all the world to hear...
> Hi,
> We use a Nokia 8310 and a Nokia 6510. They're old, but we like 'em!
>
> However they both suffer from a firmware bug where the phone crase and
> reboots, usually when you're about to send a text. Now if this was a
> few years ago then we could just have the latest firmware added at a
> nokia service centre, but the ones I've called have deleted their
> files, and can't even tell me what the latest formware version are.
>
> My 8310 has v5.11 (27/5/2)
> (I've actually just bought a 'new boxed' 6510 off ebay to replace my
> wife's current 6510, so I don't know yet what version the new 6510
> has.)
>
> Anyone know how I can upgrade the firmwares / do it myself?
> Or know what the latest versions are?
> (Are they the same file for these two models?)

You need some very expensive hardware and some knowledge. If you've only
got the two to do I would send it somewhere and get it done.
--
Regards
Jon