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3750x doesn't boot after upgrade to version15

Due to a problem with POE+ i have tried to upgrade the IOS to Version15.0.2SE2,  from 12.2.58. unfortunatly the Switch doesn't boot up anymore. It starts to decompress and install the IOS 2 Times, after the Second try it displays "unable to boot" and the switch goes in Bootloader-mode.

When i look at the version i See that bootloader is still the old version 12.2.58.

It seems that the bootloader doesn't geht upgraded and that's why the Switch can't Boot the new Image.

Is there anything i can do to Upgrade the bootloader seperatly?

It's a 3750X48PF-S

Many thanks

Andy

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