Actually the BASE.RKW format looks like this:

1) Header - start with "KRDL", the struct is in rkwpatch.c and can also be found somewhere in the SDK (has a CRC32 value of the header at the end). This part needs no modification if you change some bytes in the code.
2) code + CRC32 appended - ARM binary code & CRC32 of the code.

So basically if you want to change some bytes in the code: load the whole file into a buffer, change your bytes and replace the last 4bytes by the crc32 value of the code (code means the data starting from sizeof(header) and ending at filesize-4). Then you write the whole buffer to a file and you have a modified and working firmware. This amounts to doing some fileio and using the crc32 code from rkwpatch.c (+ that header iirc).

Regards

16GB MP5 PMP -4.3" LCD + SD CARD SLOT <OZ SELLER - OZtion Auction Item 6936472

look at this player, it's RK2706 based and has RKP platform. The auction is ended but it proves that it is possible, maybe ZSP500 also has no problems with ZSP400 instructions? If this player runs RKP natively it is as I said, and we have already got the compiler. It has up to 32bit data types so no huge limitations will arise. Other possibility is that RKP files are emulated, and it would also be useful if we got the FW of such a player.

I think I've been cheated by TinyDeal. I am not really sure but they may sent me a hacked player which appears to be 8GB but its actually 4GB. I can't believe my own eyes. I didn't check it at first because 8GB is a lot of space, besides I've got all my music in SD Card. But I tried to put some films in it, and I cant read them now.

I'm just performing the full test on the player by some freeware tool, to eliminate some FAT32 errors and be sure whether I can store >4GB or not.

EDIT: Everything I put above 4GB is not readable, either in the player or on the computer. I've been cheated!! :-(

I have opened mine.
I can clearly see that two 4GB MLC NAND flash chips are there.
You probably have the same ? Do you plan on opening your player ?

Is it easy to open it? I mean, will I make scratches while doing this?

BTW. Haven't you got the same player but 4GB version? I think you mentioned that somewhere here, but I may be wrong.

This player? 8GB 3 16:9 QVGA MP3 MP4 MP5 Player FQ5-8R [MP4] - $43.70 : TinyDeal Direct Online Store, MP4/MP3 Player, Mobile Phone, Memory Card, Accessories

That's the Google cache. They don't seem to have that anymore, but, curiously, they do have the 4GB version:
4GB 3 QVGA 16:9 MP3 MP4 MP5 Player FQ5-4R [MP4] - $37.81 : TinyDeal Direct Online Store, MP4/MP3 Player, Mobile Phone, Memory Card, Accessories

Where does it identify as an 8GB player, in the system info panel?

Everywhere, but when I put more files in it, they are either completely unreadable, or partly. Sometimes it breaks the structures of the directories, and makes them undeletable.

I contacted them, and waiting for answer.

Sorry to hear about that. Hope you can get it resolved in a reasonable manner.

Sorry to hear about your problem flasher.
It could a defective player, badly soldered memory chips or something.

I don't think the seller is always aware of hacked players, akaik the hacking is carried out by this factory to increase their profit, hope you can get this problem resolved.

btw it's a bit tricky opening this player up, I had to do it once to short out the nand to get into rockusb mode.

You need to remove the 2 screws from the end and ease the player apart in the middle, there are 2 hidden tabs that hold the player together in the middle, but I did scratch my player a bit because I tried to force it apart without realising about the 2 hidden tabs.

Also the buttons are a bit tricky to line up when re- assembling the player.

How to take off that memory hack? I even identified from what address the dummy memory starts. But still I don't know how to format it to 4GB. Is there any utility where I can choose the region?

I contacted TinyDeal, but some idiots work there. They ask me stupid questions... e.x. they want to have a photo of system information on screen of the player. I told them it shows 8GB and they seem not to read my emails with understanding... I know my English is not perfect but damn, it's understandable.

BTW. Sid and Knob, did you tried to run Ramos 970 Firmware on our player? Does the audio work well or it is distorted?