i did so but nothing working just blank i plug charger hole night but nothing

Well, it is NOT rocket science. Just back up each single step, you will get it.

So, you plug the tablet in hole night and screen still blank, right?

try this in order,

1) take the battery out, make sure you know the battery orientation, and sing a song, then put it back in. Does it solve your problem?

2) Swap with a surely charged battery, if you have one, and put it in. Does it solve your problem

3) Swap your tablet charger with your cell phone charger, (you said you have a phone that use Nokia battery), and charge it for a couple of hours. Does it solve your problem?

4) Put the tablet in a clean plastic bag, and put the bag in a refrigerator, NOT FREEZER, and sing 5 songs, and take it out and press the power button and if it turns on immediately flash to the latest OS. Does it solve your problem?

5) want more ?

bun

Thanks bun I already did so, what really kill my lovely N810 I don’t know but last when i was trying to update don’t know what goes wrong that kill it, after lot of searching i come to know that may be the image which I download could be corrupted

1. Do you have the Nokia reflashing software downloaded and a Windows PC ?
2. Then install the downloader on a Windows PC. See a link into this page: http://wiki.maemo.org/Updating_the_tablet_firmware
3. When you can get the tablet powered on, reflash it as described in the link above.