Why cannot some S3752 series switches establish stacks?

Run the display version command on an S3752 switch.
[Unit 0] EMFEA uptime is 0 day, 11 hours, 8 minutes
128M bytes DDR Memory
16M bytes FLASH
Pcb Version : CX22EMFEA REV A
Basic BOOTROM Version : 209 Compiled at Nov 6 2010, 16:31:25
Software Version : VRP (R) Software, Version 5.70 (S3752 V100R005C01)
If the version of the printed circuit board (PCB) is CX22EMFEA REV A, the switch does not support stacking.

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