BSOD 0x420 (XBOX_360_SYSTEM_CRASH_RESERVED): causes and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: XBOX_360_SYSTEM_CRASH_RESERVED is a reserved Xbox-range crash value without a more specific public failure contract.

Could be also:
Constant	Type	OS
ERROR_SERVICE_ALREADY_RUNNING	Win32 error	Windows

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XBOX_360_SYSTEM_CRASH	BC_BLUETOOTH_VERIFIER_FAULT

XBOX_360_SYSTEM_CRASH_RESERVED

Reserved Xbox 360 crash value for XBOX_360_SYSTEM_CRASH_RESERVED

XBOX_360_SYSTEM_CRASH_RESERVED is bug check code 0x00000420.

This Xbox-range value is marked as reserved by its name. It can still appear in symbol tables, but a page should treat it as a reserved diagnostic bucket unless a dump provides a platform-specific interpretation.

How to read it in a dump

Do not infer a detailed root cause from the reserved name.
The code may be a placeholder or provider-defined bucket in platform diagnostics.
Only dump context, title logs, and platform logs can identify the actual subsystem.

What to check

Check whether the code was generated by test tooling, platform firmware, or compatibility infrastructure.
Keep title and platform logs together with the dump.
Avoid user-facing hardware conclusions from this reserved value alone.

References

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