Not generic firmware, this particular firmware. 1-2K GBP is sort of
what a geenrous boss might offer in kind to an employee to 'rescue'
that amount on their own time when the source has been lost. Yes, if
you're actually paying commercial rate for it - no way. I guessed,
perhaps wrongly, you might attract a hobbyist developer for a bounty
at that price.
Further the bounty rates I've seen like Squirrelmail[1] aren't even
mid-90s UK commerical rates, and it'd cost you more just to issue an
invoice than people were offering Trisquel for somethings. So unless
I'm wrong about bounties rather than actually hiring someone to do
it, which would be a huge amount more in the UK, you should start a
side line in 'running your own free software business' courses. :-)
[1] http://squirrelmail.org/donations.php#smbounty