I have a GS2 ver 2.11. Essentially they work the same (written by same company from the same source code). I would highly advise against the knife/credit card trick though. There are some rubber grommets at the front edge of the drive housing that help stabilize the tray. You can easily push these off without knowing it. If you ever come across a small rubberband about the size of the bands used for dental braces, you've found one of them. Losing these can cause some trouble booting games on unbalanced media, and you have to open the case to put them back in. You can also crack the plastic along the edges of the tray's guide pin, causing it to slip out of the track.
The no solder plugs are going for around $10 to $20 (US) just about everywhere (plus shipping). They are nowhere as good as the Messiah, but they are far safer alternative to the knife trick.
www.modchipinc.com is selling the v5 no solder for $9.99 right now--they may have a similar deal on a v4 compatible version. I would highly reccomend you try this route and save your machine.
NightStalker has posted an alternate method for booting troublesome DVD-R's that seems to work well for him. You might want to start a new thread to his attention for help with DVD-R's that don't want to boot--you HAVE to have a modchip to use this method.
Good Luck!
Raist