Hello Jenny,
Possibly some good news.
I have been searching virtually all afternoon for an English manual for your NHZN-W57, without success.
However, I have also contacted someone in Bangadesh requesting if he can still overcome locked units.
He has now responded confirming he can.
He has requested $20 usd and some photos of the unit.
I realise this could be a scam, but I don't think so. I have approached him, not vice versa.
If it were me, depending on how the payment is made, I would risk it.
I can't see any risk in sending him a photo, or two.
I wrote to him as a Moderator of this Forum and he is offering the service for $10 usd if I include a link to him.
I cannot see why I shouldn't, furthermore, if you were not successful I might publish that also on the Forum.
Is it OK for me to contact him on your behalf, or would you prefer to do that, or would you prefer to take no action at all.
If you wish to proceed, I'll contact you privately.