does this post in the old forum from Lobo still hold true?
- change the value in civicrm_custom_field
- change the column type in the value table
- truncate civicrm_cache
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Sometimes its possible to change the field type from UI, but it totally depends upon from what field type you want to convert to.
An easy win would
If the change would involve data type like text to int or float etc it would involve