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upgrading eMMC Storage

Hi
I have an 2/16GB upboard, i find the flash to small ( I know, should have ordered a bigger one
)
I would like to upgrade the eMMC16-M525 by (BGA) soldering a new nand chip? besides the question if it is wise to do, i know the risk and I'm an expert in BGA rework and reballing
1. What are the limits, (64GB/128GB?)
2. What happens when I mount an empty eMMC?
3. Is there a bootloader, EFI or an RCW (Reset control word) partition pre-programmed in the flash, and if yes, what is needed to program this?
I have an 2/16GB upboard, i find the flash to small ( I know, should have ordered a bigger one

I would like to upgrade the eMMC16-M525 by (BGA) soldering a new nand chip? besides the question if it is wise to do, i know the risk and I'm an expert in BGA rework and reballing

1. What are the limits, (64GB/128GB?)
2. What happens when I mount an empty eMMC?
3. Is there a bootloader, EFI or an RCW (Reset control word) partition pre-programmed in the flash, and if yes, what is needed to program this?
Comments
As for the limits I'd suggest to take a peek in the cpu datasheet.
Thanks for the suggestions, I have orderd a 32GB eMMC chip on eBay and have successfully replaced it. it running fine now!
If needed, i can help anyone with this
(DenBosch Netherlands)
specification of current populated flash
Kingston EMMC16G-M525
- 16GB
- Emmc 5.1 HS400
- 11.5x13x1.0
I made a list with the options i found to be feasible
Sk-hynix - H26M64208EMR (64GB)
Samsung - KLMCG4JENB-B041 (64GB)
Toshiba - THGBMBG8D4KBAIR (32GB)
Toshiba - THGBMHG9C4LBAIR (64GB)
Toshiba - THGBMHT0C8LBAIG (128GB)
http://www.ebay.nl/itm/THGBMHT0C8LBAIG-TFBGA-153-eMMC5-1-128GB-Flash-Memory/222200935717
Did you apply flux?
I did something like this before but with less pads...