HP LaserJet Enterprise M552 - 55.00.05 Engine Firmware RFU Error; 55.01.06, 55.02.06 DC controller error To continue turn off then on; 56.00.01 Illegal Input Printer Error

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55.00.01–DC controller memory error.
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55.00.03-DC controller no engine response
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55.00.04-DC controller communications time out
Recommended action
Turn the product o and then on.
Verify that the all connectors on the DC controller are seated correctly.
If the error persists, replace the DC controller.
55.00.05 Engine Firmware RFU Error
Description
The rmware upgrade failed.
Recommended action
Turn the product o and then on.
If issue remains re-send upgrade.
55.01.06, 55.02.06 DC controller error To continue turn o then on
Description
NVRAM memory warning
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55.01.06 (event code)
NVRAM memory data error warning
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55.02.06 (event code)
NVRAM memory access error warning
Recommended action
Turn the product o, then on.
If the error persists, replace the DC controller PCA.
56.00.01 Illegal Input Printer Error
Description
The product experienced an illegal input.
Recommended action
Turn the product o, then on.
Remove any third-party hardware and test again
ENWW Tools for troubleshooting 341