i-Series CPU Board (CPUB) Issues: Diagnosis and Repair Solution

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  • Sebulbabobi
    Junior Member
    • Sep 2023
    • 3

    #31
    Originally posted by stronghold

    Have you updated the firmware of the SPI FLASH? CPU1, CPU2 and Boot ROM?
    The update procedure is described in this post. LINK
    Last year, when I replaced the SSD, I didn't update CPU1 or CPU2; I only updated the Boot ROM for SSD recognition. And now, when the client called about the problems, I went to the equipment and updated CPU1 and CPU2, but nothing changed regarding waking from sleep mode.

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    • Esron Thomas
      Technician
      • Oct 2024
      • 43

      #32
      Originally posted by stronghold
      Greetings to everyone on this forum.
      I want to share a significant observation about i-series.
      Based on my repair experience, I have currently restored CPUB boards from various models with different i-series symptoms. I can confidently state that 90% of unexplained problems are related specifically to this board.

      Symptoms:
      • Doesn't wake from sleep mode
      • Boots to 25%
      • Boots to 50%
      • E301 error
      • Random reboots
      • Incorrect time display
      • MANY OTHER SYMPTOMS UNRELATED TO MECHANICS

      Let me start from the beginning...
      05.2022 - The first board that came into my hands was from bizhub C257i. Symptoms: Doesn't wake from sleep mode. Only resolved by unplugging the 220V power, and after a few weeks, it completely stopped booting and froze at 25% loading.
      The firmware installed was G00-P8. (!!!Attention!!! At that time there was no solution yet for flashing CPU1, CPU2, BootRom).
      At that time, there was only the GX-** service tool for diagnosing boot issues with SPI-FLASH and SSD (microSD) board. Running the Service Tool, it showed me that SSD - NG (Change SSD). Checking Infohub, I found document "RFKM_BT 22 13707 EN" which states "The specification of PHISON and KIOXIA storage boards will be changed from 96 layer to 112 layer due to EOL of supplier around July 2022."

      All attempts to unbind the Encryption Key were unsuccessful. The SSD was only visible in READ ONLY mode.
      For SSD testing ideas, I decided to install a MicroSD card and flash it with the current (at that time) firmware. When removing the SSD, I saw that I had a PHISON 256GB 64 layer installed. After spending more time searching for information, I came across bulletin 06.2021 "KBA00048401". I'll describe briefly: It says that if you have a 64 layer SSD installed, you need to upgrade the Storage Controller firmware from E8FT10.7(G01-07) to E8FT10.8(G01-08). The bulletin states that for this procedure, I need to download firmware FW_ACM10Y0-F000-GXX-02.

      Downloaded, installed according to the manual - the device wrote OK and requested a reboot. Armed with the GX-** service tool, I again tried to unbind the Encryption Key from the SSD to make it exit Read Only mode, but all without success.
      Decided to switch the device to MicroSD.
      Purchased a 128GB Kingston Canvas microSD Class10 UHS-I U3 (V30). Installed it in the device (pre-formatted as FAT32) and tried to flash. The firmware installed without problems and the device started. It gave an error (I don't remember which now) = Solution: In Service Mode -> System 2 - HDD - select MicroSD. The device booted with a Recovery error, I confirmed the Recovery procedure and voila, the device works!
      But the funniest thing is that the problem with the device not waking from Sleep Mode - WAS NOT SOLVED!!!
      Everything I tried... Firmware replacement, MicroSD replacement.... Many manipulations I performed until I gave up and ordered a new CPUB and new NVMe.
      So, the non-working board was in my hands. Putting it ASIDE, I worked on current repairs. About a year passed, I came across this information.... Problem Solution PSKM_BT2313872EN "System clock of MFP Service Mode loses 80 seconds by updating Other FW"
      The procedure is:
      1. Connect the USB memory to the USB port and start firmware update.
      2. When Firmware Update screen is displayed, enter magic sequence code.
      3. Select [Other FW Update] > [Power Control CPU1] and start update.
      4. Confirm that MFP restarts normally.
      5. Update [Power Control CPU2] and [Boot Rom] as well.
      Finding that old board, I TRIED to update all these points.
      CPU1 flashed normally, CPU2 flashed normally... Started flashing BootRom - the device immediately rebooted, although at the end of flashing it should itself ask you to power off/on the MFP.
      Trying to start the device - it showed no signs of life, EXCEPT for the mechanical part controlled by the Control Board, which has nothing to do with CPUB startup.
      LET'S examine the CPUB board design. Noticed that the board has 3 SPI flash chips installed.
      Since the board was non-functional in my hands, the SPI flash, installed it on the programmer and tried to do read/write.
      Read - works
      Write - goes into short circuit, meaning SPI flash read only status.
      These SPI have read/write limits. If the limit is exceeded, SPI goes into read only mode.
      After some manipulations, I replaced the SPI flash and.... OH MY GOD, the CPUB board started up and allowed updating CPU1, CPU2, BootRom.
      I didn't stop there... Installing the old NVMe 64 layer, I tried to reset the encryption key and.... SUCCESS again awaited me!
      After this, we urgently began installing updates across the entire i-series.
      At this point, I have RESTORED over 20 boards, and CPUB replacement was not required.
      I got this issue today, c360i have been freezing constantly, when I update the firmware, it shows download completed but when it reboots it stops at half way and stays there for ever, tried power cycle but still not working,

      If there's any thing I can do first before storage initialize?

      Thank you in advance.

      Comment

      • stronghold
        Technician
        • Apr 2023
        • 47

        #33
        Originally posted by Esron Thomas

        I got this issue today, c360i have been freezing constantly, when I update the firmware, it shows download completed but when it reboots it stops at half way and stays there for ever, tried power cycle but still not working,

        If there's any thing I can do first before storage initialize?

        Thank you in advance.
        Have you done THIS procedure?
        If you have updated CPU1, CPU2, and BootRom and nothing has changed, then install a microSD card to make sure that everything is OK with the board.
        Install the microSD in the device, install the firmware. If the device boots without problems, the problem is in the NVMe storage. If during the update of CPU1, CPU2, and BootRom there are problems (for example, the device itself may reboot. After installation, you only have a black screen, and the mechanics start ...), then you have problems with the SPI flash on the CPU board.

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        • Esron Thomas
          Technician
          • Oct 2024
          • 43

          #34
          Originally posted by stronghold

          Have you done THIS procedure?
          If you have updated CPU1, CPU2, and BootRom and nothing has changed, then install a microSD card to make sure that everything is OK with the board.
          Install the microSD in the device, install the firmware. If the device boots without problems, the problem is in the NVMe storage. If during the update of CPU1, CPU2, and BootRom there are problems (for example, the device itself may reboot. After installation, you only have a black screen, and the mechanics start ...), then you have problems with the SPI flash on the CPU board.
          Not yet, never heard of it yet, only knew storage initialize. Thank you I'll try check out the steps and try it out

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