enough space on SDHC ?
No failure on memory card ?
did you used 3CX iso to install?
Did you follow the information in this document https://www.3cx.com/docs/installing-pbx-raspberry-pi/
Maybe worth starting from scratch and post the errors on the initial setup
Does the spec of your PI meet the minimal spec - 4mb or 8mb version and 32 gb+ card
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