It sounds like you’re referring to a document or tool related to —specifically “V4 and V5” algorithms. These are used to generate unlock (NCK) codes for certain Huawei devices (often 3G/4G modems, routers, or phones) that are carrier-locked.
If you want to try the only functional "online calculator" for V5: WORK- Huawei New Algo V4 And V5 Unlock Code Calculator
Huawei officially stopped providing bootloader unlock codes in July 2018, citing "user experience" and security. For the community, the V4/V5 algorithms became the last line of defense for users wanting to install custom ROMs or use their modems on different carriers. It sounds like you’re referring to a document