I cant unloock my iphone to the version 1.1.2 because always said me that i don't have install the oktopred (before in the version 1.1.1 i install with out problem).... my question is If there are any way for download this soft with safari or other way.

thanks

Try it with this tutorial but follow carefully Step 8 of the UPGRADE TO 1.1.2 chapter at the end of the tutorial. If after Activation/JB/OkToPrep you click on Restore to 1.1.2 instead of Update, OkToPrep will be simply wipped out.
http://www.iclarified.com/entry/index.php?enid=358

Cheers

the problem is the same when i try "jailbroken" he said me taht i don have installed oktopred...... i try in 3 different computer. i dont understand what happen, because i got it in others 2 iphones at the first time.....

thanks for you help me

Then try virginizing the phone by following this link: http://iphone.unlock.no/#how-to-down...inize-baseband (quite straightforward), restoring to 1.1.2, restoring 1.1.1 etc etc. If our phone was anysimed before, you need to virginize. Take a deep breath and follow carefully the iClarified tutorial. It should take 90mn but your phone will be working just fine afterward.

Cheers

my iphone is otb 1.1.2 and i can't downgrade bootloader .... now i have the iphone firm 1.1.1 with jailbreak.... my question is if is possible install the oktopred with out the installer bcause i think that my problem is that not is well the installing of oktopred or not launch this software....

sorry for my english

Well, if you missed the last step (option+Update thing) or if OkToPrep won't work (obviously cause it's wipped out), my advice: restore your phone and then follow this tutorial (which I followed btw): http://www.iclarified.com/entry/index.php?enid=455 if you're using a Mac or http://www.iclarified.com/entry/index.php?enid=461 for Windows.
Otherwise, you can find a whole bunch of OkToPrep just by using Google.
P.S. I also have a 1.1.2 OTB and had no problem whatsoever JBing. Even istalling an *sim worked perfectly.

Cheers

oktoprep is just running a mknod command to create a 'disk' at private/var
you can check whether 'disk' exists
you can even do it manually
http://www.hackint0sh.org/forum/showthread.php?t=17799