A few weeks ago, I got the bootloader code and edited it a little bit. Thanks to qubitz, it should now work on 1.0. The only problem, I can't find anyone on IRC with a 1.0 to test it (McZonk is the only person I know, and he said no).
So... if you have a 1.0, and want to test OSS, then please post here. I promise you there is no chance of bricking your PSP with it, it is as safe as the stable builds of OSS.