To change the CID you need:
S-off
Reboot phone in bootloader
On the PC, run the command line
Go to the folder with fastboot (for example, cd c: \ android)
Make sure the phone is visible on the PC
fastboot devices

To change the CID run the command
fastboot oem writecid XXXXXXXX


where XXXXXXXX - cid. Cid length of 8 characters, for example, HTC__A07 - two underscores Russia's seed, 11111111 - SUPERSEEDВ®.

Microsoft Windows [Version 10.0.10240]
(c) Microsoft Corporation, 2015. All rights reserved.

C: \ Windows \ system32>cd \ Android

C: \ Android>fastboot oem writecid
...
(Bootloader) fail: [writecid] Parameter error
OKAY [0.004s]
finished. total time: 0.005s

C: \ Android>fastboot oem writecid 11111111
...
(Bootloader) SecuritySDInit: counter = 3
(Bootloader) m8_init_sd, SD card already power on
(Bootloader) [SPEW] GPIO 0 status is 0
(Bootloader) sdhci_open: id = 0
(Bootloader) Initializing MMC host data structure and clock!
(Bootloader) mmc slot # 2 clock enabled
(Bootloader) sdhci_set_clock: slot 2, freq 192000000
(Bootloader) GPLL0 is enabled
(Bootloader) clock_update_cfg_sd is done
(Bootloader) sd clock set done
(Bootloader) sdhci_set_bus_width: bus width 0
(Bootloader) sdhci_clk_supply: freq 400000
(Bootloader) Decoded CID fields:
(Bootloader) Manufacturer ID: 1d
(Bootloader) OEM ID: 0x4144
(Bootloader) Product Name: SD
(Bootloader) Product revision: 1.0
(Bootloader) Product serial number: B41604CB
(Bootloader) Manufacturing date: September 2012
(Bootloader) sdhci_clk_supply: freq 50000000
(Bootloader) sdhci_set_bus_width: bus width 1
(Bootloader) Done initialization of the card
(Bootloader) erase_grpsize: -16777216
(Bootloader) erase_grpmult: 261 078 192
(Bootloader) wp_grpsize: 0
(Bootloader) wp_grpen: 0
(Bootloader) perm_wp: 0
(Bootloader) temp_wp: 0
(Bootloader) [Tuxera] [Error] No exFAT partition found
(Bootloader) [FAT_ERROR] fat_open_file: can not find SMART_IO.CRD
(Bootloader) [JAVACARD_ERR] SMART_IO.CRD cann't find
OKAY [0.178s]
finished. total time: 0.179s

C: \ Android>