For the method you linked to, the latest firmware mentioned in it is 4.12.12111. And that is a statement that it didn't work. There are mentions that it worked with 3.19.5761 but I can't quickly see anything other mentions of 4.x firmware versions.
The original thread for changing the SD card is [URL "https://www.mobileread.com/forums/showthread.php?t 209122"]Memory Upgrade Mod Guide[/URL]. I would suggest following that as a way to change the card. That's basically the method I have used, though I didn't resize the partition before putting the new SD card into the device. Once I had tested it, I used the partition resizing from the Magic Memory Upgrade Mod.
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