The advantage of rooting is that it allows you to fix things that annoy you. If you're not annoyed by anything you may not need it. OTOH, even simple things like using a keyboard with a different layout requires rooting.
I question the necessity of doing everything in one command. If there is an issue I'd like to fix it. Please try this and post the result. Download the latest version of edl.exe from this morning, 132,608 bytes.
Code:
C:\>edl.exe /lq662.elf /v
C:\>edl.exe /r /pboot_b boot.img /t /v
The /v is not necessary, it is only for debugging. It just adds confusion in normal usage.