Do not take bottom bracket off the bottom panel.
Warning - What not to do, Do not take the bottom bracket off
No, it is not safe to remove the bottom cable bracket from a sectional door unless you are first tension-free and are certain of your actions. The bracket, cables, and springs are designed to function in conjunction and release tension when removed, which could result in injury.
Before & After Repairs
Client taken bottom bracket off the panel
Attempted to take vertical track off and made worse
safely and Professionally Repaired by Team ASI