Dark_AleX has just released a bugfix version of his Open Edition custom firmware, 3.10 OE-A'. As expected, the A2 release is a small update which fixes a simple bug in games like Metal Slug 6 and others. This bug was because the static ELF wasn't being patched correctly in some cases.

There's nothing else apart from that, so if those selected games aren't in your list, you can skip this update altogether. Though, if he releases a new update (rev 3) and you have to upgrade to it, getting this latest version will be a safer option. Anyways, here's the file. Thanks to vb_master/vulpix for the heads-up!