What is the safe temperatures range for tilera 9-core processor?
I always have 53-55 degree celsius on it.

Which model?

CCR1009-8G-1S-1S+
Tilera Tile-Gx9

This is completely normal temperature for CCR router.

Under Health menu you can configure threshold. When CPU temperature reaches this value, then router will be rebooted for safety reasons. By default it is 100C.

This is completely normal temperature for CCR router.

Current CPU processors from AMD and Intel have max safe temperature 70C, but their threshold set in BIOS is much higher, at 85-104C by default.
But if 55C is a confirmed normal, then I have no more worries about it.

Thanks.