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About upgrade of ZXCTN9000 32R1 and earlier versions, which of the following are corre

ct？()

A.BOOT version can only be upgraded by command bootrom update in hidden mode.

B. If BOOT upgrade fails, try it again but not reload the board. Make sure to prepare a few BOOTs before upgrade in case BOOT becomes abnormal due to power-off during uprgrade.

C. CPLD upgrade involves remote software upgrade and upgrade via cable. If remote upgrade fails, perform. upgrade via cable or replace the board.

D. During upgrade, execute show process to check whether the boards have gotten online and whether their corresponding slots are correct; execute show bootrom to check boot version type of each board.

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