How to root IS01 or SH-10B

check BaseBand version, ( Setting->System->Device Information ), if your baseband is 01.00.07 or 01.00.09, follow the below instructions, if not, use tools from marijuana(see below).
1. Download z4root from google market, install it and run it. Your IS01 may go panic, if so, use the reset button on the back or remove the battery for a while, then restart your phone.
2. download and install Superuser.
3. Download is01root tool from mobilehackerz, (to save you from reading japanese, you may just click link here: is01root_002.apk), and install it.
4. run is01root, click the first option (Step1:rootxxxxx... xxx stands for Japanese) on the software. It will pop up a warning box, click the left button to agree to go on. then wait for a minute, another box with "suxxxx/sqlite_journals/is01root/xxxxx" come up, again, click the left button. Then, an error message pop up, just click the "Force close" button to close the software.
5. run is01root again, click "Step2:su xxxxx", then the left button, then ok button, the is01root quit again.
6. reboot you is01.
7. run is01root for the third time, click "Step3ath xxx", then, superuser will pop up, asking you for permission, allow it, is01root will quit again.
You phone is rooted! Every time you want to use root permission, you will need to run is01root first, and click the "step3ath xx" button once!

The other way, root IS01 with tools from marijuana
with this method, you don't need to run the is01rooter every time you want to get root permission:
Download root tools for your baseband version from:
marijuana .ddo.jp/is01/index.php?moddir=downloads
and follow the japanese instruction come with the tool. (Read this English introduce by a Japanese to get more details.)

How to write system partition
If you want to make any change to system partition, you need to mount the partition writable. It can be done easily by running /sqlite_journals/is01root/sysremount_atmyownrisk.sh script if you root your IS01 with is01root, or /sqlite_journals/root/tools/sysremount.sh if you use tools from marijuana to root you phone. After that, there will be a /system.rw folder, which is a writable /system partition. NOTE: making change to /system may damage your phone, so be carefully.