I don't believe there are any WM6.1 for x50 (low).
Most ROM developers/cookers focus on the x51v first, as that is the "best" device out of the Axim series. Then the next devices are x50v, x51, and x50.
Each ROM takes considerable amount of time (Usually months) to be made. The original ROM was first made by Football because it was ported from some other device. Then ROM developers like Makuu, Lenny, Mag_Lite, and Steven use that as template to create their own "flavor" of ROM.
The Page Pool is edited by each ROM developer to suit their own taste and the trade-off between speed/simultaneous programs (Somewhat like RAM on PC) running is considered.
Then the XIP (Execute in Place) is created/modified.
After that, the image itself is tacked-onto the combo. With the image, the developer can choose to embed whatever program he wishes onto the ROM.
The ROM is then published in the form as .nb0
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I know Steven and Makuu hang out in this forum. One of them may drop by and give their expert 2 cents. I am just a beginner at ROM creation.
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XDA-Developers have some great threads to get you started. The sub-forum is crowded with other device ROMs, you are better off using the Search function on XDA.
PDA4x also has a great thread on
modifying the XIP.
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To create is ROM takes some work and patience. It also takes time and dedication (Or so I believe). If you choose to create a ROM for the Axim series, I shall be awaiting your results. :)
~John