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Changing base UUID of Nordic UART service causes it to stop working

I have successfully set up UART/Serial Port Emulation over BLE example. I have modified it so that it works with two nRF51 DKs, one acting as a central and other acting as a peripheral.

The base UUID for this service by default is

{0x9E, 0xCA, 0xDC, 0x24, 0x0E, 0xE5, 0xA9, 0xE0, 0x93, 0xF3, 0xA3, 0xB5, 0x00, 0x00, 0x40, 0x6E}

but I would like to use my own base UUID. For starters, I tried changing just one word (4th, 0x22):

{0x9E, 0xCA, 0xDC, 0x22, 0x0E, 0xE5, 0xA9, 0xE0, 0x93, 0xF3, 0xA3, 0xB5, 0x00, 0x00, 0x40, 0x6E}

I made sure that new UUID is the same on both projects, central and peripheral. However, after this change, the DK's won't even pair anymore.

What am I missing?

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