Howdy-doo. It's Friday so it's time for another edition of QJ.net's How-To Guides. This time we're going to be tackling how to install AhMan's iR Shell, something you have to try at least once, because once you start, you can't stop. Like Pringles, except it doesn't run out and doesn't leave crumbs.

As before, I advise you have our PSP Homebrew Dictionary open in another window while reading this guide so you have something to consult if you find some terms you don't understand.

So let's get cracking. Let's start off with the basics. What will you need to install iR Shell? Just two things: compatible custom firmware, and the installation files. Easy peasy lemon squeezy. So what are the compatible firmwares? You'll need M33 CFW 3.71 or above.

You don't have custom firmware you say? Worry not your little head. We have a guide ready and available for you. Just follow this link. Moving on with the iR Shell installation though, you'll also need to download the installation files. You can choose which version to install. Voila:

• iR Shell v5.0 - Has advanced multi-tasking, but only for the Slim.
  
• iR Shell v4.9 - You'll need this before you can upgrade to 4.91 or 4.92.
  
• iR Shell v4.91 - Relevant to Slim owners only
  
• iR Shell v4.92 - Minor update; fixes bugs, adds LEDA support
  

Now just download the version of your choice. If you plan to install iR Shell v4.92, you'll need to download 4.9 as well. If you've already installed a version of iR Shell lower than v4.9 on your PSP, you have to delete it first before proceeding with the installation. If you want to install 5.0, you'll have to delete any previous version as well.

To start the installation follow these steps:

1. Unpack the installation files (either v5.0 or v4.9, depending on the version you want to install).
2. Except for the seplugins folder, move all of the unpacked files to the root of your memory stick. Overwrite files when asked.
3. Run the iR Shell app on your PSP (run the white icon if your kernel is 3.xx and above, run the black icon if your kernel is 1.5).
4. Activate the directory view in iR Shell, then go to the iR Shell folder, then enter the Patch folder.
5. Select the folder of your respective firmware, and then run the patch that is in that folder (btcntpatch.prx). Don't skip this part or else you won't be able to run ISOs or CSOs through iR Shell.
   

In case you installed 4.90 and now wish to upgrade to 4.91or 4.92, then download the respective files above, and unpack the files. Transfer these files to the root of your memory stick and answer yes when asked to overwrite files.

Now in case you want iR Shell to run everytime you do a cold boot, then copy the seplugins folder from the original 4.9/5.0 install, and copy it to the root of your memory stick (answer yes when asked to merge). Do a cold boot and enter recovery mode. Go to plugins and enable irsautoboot.prx. Voila! Squeezy peezy melon cookie.

*Disclaimer: As always, please be careful when using homebrew. Your PSP is your own responsibility.