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What should I check after changing PCs or hardware?
Guide Q&ASign in with the same purchase email, download the current build, and request a device reset from support if the loader no longer recognizes your PC.
Avoid changing several system identifiers at once while troubleshooting.
Based on: League of Legends setup and account access guide
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Guide replies 1
From the source articleUse official support for HWID resets instead of third-party “spoofer” tools.