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PS Vita Half Byte Loader (HBL) Development FAQ by Wololo


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154w ago - Today PS Vita hacker wololo has made available a Half Byte Loader (HBL) development FAQ for those interested in progress thus far on Sony's PlayStation Vita handheld console.

Also below he [Register or Login to view links] that he has ported HBL for Teck4's exploit successfully and updated to EU/US versions.

To quote: I managed to port HBL to the US version of Teck4′s exploit in exactly 45 minutes (including writing the savedata exploit and the binary loader), which is a new personal record, thanks to the scripts included in HBL's repository, and also to the fact that the different versions of the game are internally fairly similar (which is to be expected because technically the game is supposed to be the same, just translated, but I seem to recall it wasn't that easy for the Hotshots golf exploit)

I also updated the EU/US versions of this HBL port to get the tweaks I worked on for the past weeks in order to get a fair amount of homebrews to work.

The next step for me is to write a bit of documentation on how to use all this, and then patiently wait. As far as a release is concerned... well check the FAQ I wrote yesterday.

I could spend time polishing this port of HBL for the Vita, improve compatibility, and I might do it, but since there's a high risk this gets used by only a small amount of people before it gets patched, I'll probably leave it in its current state for now. It's probably not worth working too much on the details if nobody ends up using it. Of course if by some sort of miracle this doesn't get patched immediately by Sony, I'll update it accordingly.

Now let's all wait (I'm probably more excited than anybody else about this release, really...)

A FAQ for HBL on the Vita

We've seen through Teck4′s exploit that PSP exploits run flawlessly on the PSP emulator of the Vita. I've spent the past 3 weeks working on leveraging Teck4′s exploit and port HBL to it. I've been receiving lots of questions (probably from people who haven't used HBL back when it was the only possible way to play homebrews on the PSP Go) and will try to answer them here.

What is HBL?

HBL stands for "Half Byte Loader". This is a homebrew loader for the PSP, which was written initially by m0skit0, then improved and maintained by a bunch of devs including myself (those two links are good old memories, when HBL wasn't loading a single homebrew properly). It basically allows to run fanmade games, emulators, etc on the PSP. We've found that it can run on the PS Vita through the PSP emulator.

Will this allow to run PSP backups (isos)?

Although in theory that would be possible, HBL only has access to the PSP "user mode" which is fairly limited. Practically, all teams who have tried to create an iso loader in user mode on the PSP have failed so far.

Will this allow to run PS Vita game backups?

No

Does this give us access to the Vita hardware (touch screen, etc)?

No. HBL accesses the hardware through the PSP emulator, and therefore only has access to what is mapped to the PSP controls. It also only has access to 32MB of ram, etc

Does this give us possibilities to hack the vita further?

Most likely, not. HBL is stuck in user mode, in a sandboxed emulator. To get access to Vita information, we would need first to get kernel access in the emulator (through a psp kernel exploit), and then find other exploits in the emulator/OS itself to break away from the sandbox (which, if the Vita OS is as secure as I think it is, is close to impossible)

But will it give us more horsepower than the psp? Can we expect emulators to run faster, etc?

This still needs to be investigated deeper, but from what I've seen, not really. Memory stick access is definitely faster on the vita (Wagic loads between 5 and 10 times faster on the vita than on a psp go), but the rest seems to follow the psp limitations (as one would expect from an emulator)

Will this be made public?

Yes. Teck4 (who found the exploit) and I agreed to making this public at some point.

When will this be made public?

Some time after the Vita is released worldwide.

I heard Sony can patch this very easily as soon as it's made public?

Yes. Since this uses a vulnerability in a PSP game, as soon as they know which game it is, Sony can remove the game from the PS Store. Once they do that, they can patch the Vita firmware to reject the "malicious" files (either by preventing them from being copied through the content manager assistant, or by patching the PSP emulator, or by patching the PSP game, etc). At that point, people who don't already have the game on their console won't be able to use HBL. Also, people who do have HBL will need to never upgrade their firmware, will have to use some tools such as OpenCMA in order to copy files to the vita, and will be locked out of the PS Store as long as they want to use homebrews.

So shouldn't you keep this under wraps instead?

Meh, it's not like anything is really secret here besides the name of the game. It's already pretty sure this is not useful for hacking the vita further, so even if it gets patched I don't think we will lose "too much".

No iso, no access to the vita internals, and Sony will patch it as soon as it's out, so basically it's useless?

Yes and No. Technically, a hacked PSP is way cheaper and will allow you to do more than that. But this is, as I write these lines, the only way to run unsigned code on the Vita, which in itself makes it a great achievement (and it's always cool to show your friends that your Vita can run Mario, and theirs can't). Also, it didn't take too much time to adapt since most of the code was already available from our past work in the psp scene. It would have been even more useless to say "oh yeah, interesting, we can run psp exploits on the vita" and not do anything with it.

How do you copy/install homebrews to the ps vita, since it cannot be mounted as a regular usb drive?

This will be explained when HBL is released.




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Comments 191 Comments - Go to Forum Thread »

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#151 - Prince Valiant - 153w ago
Prince Valiant's Avatar
I'm getting one as early as I can to get a low firmware model, provided it isn't too high.

#150 - Neo Cyrus - 153w ago
Neo Cyrus's Avatar
Quote Originally Posted by ModderFokker View Post
I hope a couple of exploits are kept secret until we actually can buy the damn thing.

(Not talking about import ....)

Meh, it's going to be a game of cat and mouse as usual. They're going to constantly tighten their draconian grip around the throats of their customers while more exploits to free the hardware keep getting released, an endless cycle like always.

As I said before I'm not even considering buying one until it's cracked wide open and until there are Micro SD to whatever-it's-proprietary-nonsense-is-called adapters. There will be for sure, just as there were 2 Micro SD to Pro Duo adapters.

#149 - moja - 153w ago
moja's Avatar
I wouldn't be surprised if the US launch saw an even later firmware (1.6?). Hopefully the scene for Vita stays motivated and finds some reliable homebrew.

#148 - Prince Valiant - 153w ago
Prince Valiant's Avatar
Indeed, at least he didn't reveal them specifically. I hope the launch firmware isn't very high for the US.

#147 - ModderFokker - 153w ago
ModderFokker's Avatar
I hope a couple of exploits are kept secret until we actually can buy the damn thing.

(Not talking about import ....)

 

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