Don't know if violates any rules, but here it is on my drive: multitool.img.xz
But I don't know if you will be able to download the images from @jock repository, is unresponsive all links. I noticed yesterday.
@Felipe Muniz I don't think it was a good idea to change the NAND. AFAIK, eMMC can be switched with no real software issues, but NAND chips in my opinion are way thougher because they require a software layer (the FTL) to work correctly. The proprietary NAND driver contains the FTL routines for a bunch of vendors and specific parts, so IMHO you can't put any bigger/better part and expect to work out of the box.
You may boot in maskrom mode, upload a recent loader and see if rfdeveloptool/rkflashtool detect the nand parameters correctly (size, vendor, page size, ecc bits, etc...),otherwise I would not expect it to work in any way.