656 is indeed a very old build. My memory is very unreliable that far back, but I believe there was once some builds that did not have the "sudo" command. This was not really an issue, since when you needed to do something as root, you could just log in as root:
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# su -
You could then run commands as root, such as "olpc-update".
But then we get into the second issue. "olpc-update" was introduced in a later build. But even if you had it, it wouldn't help you because you said you have no internet connection. This poses a major problem as "olpc-update" downloads the updates.
Your best (only?) option is the update using the USB drive offline.
I tried the offline method using a usb stick, but it didn't work.
Alas, if you tried it and it didn't work, then that would indeed pose some real problems.
Fortunately, this part of your description is very sparse. Only a one line "but it didn't work". Perhaps if we could expand on this, we could find out what part of it didn't work, why it didn't work, and how to get it to work!
First off, you are using a very old release. In order to bring it up to date, you will need to do this in a 2 step process:
Step 1: Update using the No Fail Update up to 8.2.1 http://wiki.laptop.org/go/No-fail_update
After you update to 8.2.1, you can then bring it up to the latest.
Step 2: Update to 10.1.3 using "Simple Offline Update" http://wiki.laptop.org/go/Release_notes ... ine_Update
Please give this a try and tell us how it goes.
Note: Since you do not have net connection at home, the first thought is probably to download all the files for both versions while you can, then bring it home to do it at your leisure. This could be a good idea. But if you do, remember to ONLY have 1 set of files on the USB stick at a time. Move versions on or off the drive depending on which one you are updating, but double check to not have both versions on the drive at the same time.
Finally, if you are finding that you are using the device and running out of memory a lot, consider a little "advanced" trick. You can purchase a 8 or 16gb SDHC card (common for cameras these days), and insert it into XO, then install onto that and boot and run from the SDHC card. This should increase your available space by a lot!
* http://wiki.laptop.org/go/Release_notes ... xternal_SD
Unfortunately, as mentioned above, this topic is a little advanced, and assumes you are familiar with the tools. Don't try this if you don't feel comfortable!