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Then you need to backup your site and enable the "Force auto-update, even if some files were modified" option. Then after finishing of update till 12.1 disable it again.
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Yes; I tired that. Even with "Force auto-update, even if some files were modified" turned on, it tells me that too many files have been modified (which is not true, no files have been modified, must be part of the UNA 13). Therefore, my sys-admin wants to disable this check completely in the code. She does have php skills. I was hoping you could save me some time and instruct which file contains this code.
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