The battery slot is for devkit and godbox timekeeping, those things have capabilities certificates signed extremely tight, usually only valid for a couple of days. If the certificate time slots are out of tolerance, the machines will require server re-authentication when booting. If that fails, the bootslot becomes locked and a full system restore is needed. To avoid such headaches, those custom-made kits have the CMOS battery installed.
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Retail units don't have this problem so the clock battery isn't needed.
The missing eMMC chip is present on Xbox One for hypervisor boot and console identity certificates. On Xbox Series consoles, these boot files are placed on the SSD instead so MS can omit the eMMC chip to save $2 per console, at the cost of permanently bricking the console if the SSD goes bad.
You can probably solder some of the parts on, however if any software changes are required to utilize them, there is nothing you can do as the console remains hackproof at this point.
The battery slot is for devkit and godbox timekeeping, those things have capabilities certificates signed extremely tight, usually only valid for a couple of days. If the certificate time slots are out of tolerance, the machines will require server re-authentication when booting. If that fails, the bootslot becomes locked and a full system restore is needed. To avoid such headaches, those custom-made kits have the CMOS battery installed.
The missing eMMC chip is present on Xbox One for hypervisor boot and console identity certificates. On Xbox Series consoles, these boot files are placed on the SSD instead so MS can omit the eMMC chip to save $2 per console, at the cost of permanently bricking the console if the SSD goes bad.
You can probably solder some of the parts on, however if any software changes are required to utilize them, there is nothing you can do as the console remains hackproof at this point.