[Huawei Mate 20 Pro Questions & Answers] TheLostOne:
Thanks for your tips!

I managed HiSuite to recognize it (via a USB hub) but recovery failed with the message "Your device is not supported for system recovery.

2023-09-06 22:51:58:787][L2_VIM][sn=1][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: IsRescueMode return [tid=15208]]]]
[2023-09-06 22:52:06:813][L2_VIM][sn=2][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: IsRescueMode return [tid=15208]]]]
[2023-09-06 22:52:08:979][L2_VIM][sn=3][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: IsRescueMode return rescue_version: rescue0.8\r\nfinished. total time: 0.063s\r\n[tid=15208]]]]
[2023-09-06 22:52:33:623][L2_VIM][sn=4][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: getvar system_update_state return [tid=15208]]]]
[2023-09-06 22:52:39:645][L2_VIM][sn=5][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: getvar devicemodel return [tid=15208]]]]
[2023-09-06 22:52:45:658][L2_VIM][sn=6][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: get-product-mode return [tid=15208]]]]
[2023-09-06 22:52:56:732][L2_VIM][sn=7][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: getudid false[tid=15208]]]]
[2023-09-06 22:53:01:786][L2_VIM][sn=8][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: GetEncryptIMEI false.[tid=15208]]]]
[2023-09-06 22:53:06:846][L2_VIM][fn=1][RESULT: FALSE][HiSuite_SystemUpdate][[[CAUSE: ERROR_CODE=0]]][[[DATA1: oem get-psid return ...\r\nFAILED (command write failed (Unknown error))\r\nfinished. total time: 5.001s\r\n[tid=15208]]]]
[2023-09-06 22:53:11:908][L2_VIM][sn=9][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: getvar vendorcountry return getvar:vendorcountry FAILED (command write failed (Unknown error))\r\nfinished. total time: 5.000s\r\n[tid=15208]]]]
[2023-09-06 22:53:16:967][L2_VIM][sn=10][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: oem oeminforead-SYSTEM_VERSION return ...\r\nFAILED (command write failed (Unknown error))\r\nfinished. total time: 5.000s\r\n[tid=15208]]]]
[2023-09-06 22:53:22:029][L2_VIM][sn=11][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: oem get_ab_slot_status return ...\r\nFAILED (command write failed (Unknown error))\r\nfinished. total time: 5.000s\r\n[tid=15208]]]]
[2023-09-06 22:53:27:098][L2_VIM][sn=12][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: oem oeminforead-SYSTEM_VERSION_B return ...\r\nFAILED (command write failed (Unknown error))\r\nfinished. total time: 5.001s\r\n[tid=15208]]]]
[2023-09-06 22:53:32:174][L2_VIM][sn=13][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: oem oeminforead-BASE_VERSION return ...\r\nFAILED (command write failed (Unknown error))\r\nfinished. total time: 5.000s\r\n[tid=15208]]]]
[2023-09-06 22:53:37:249][L2_VIM][sn=14][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: oem get_ab_slot_status return ...\r\nFAILED (command write failed (Unknown error))\r\nfinished. total time: 5.000s\r\n[tid=15208]]]]
[2023-09-06 22:53:42:322][L2_VIM][sn=15][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: oem oeminforead-BASE_VERSION_B return ...\r\nFAILED (command write failed (Unknown error))\r\nfinished. total time: 5.000s\r\n[tid=15208]]]]
[2023-09-06 22:53:47:388][L2_VIM][sn=16][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: oem oeminforead-CUSTOM_VERSION return ...\r\nFAILED (command write failed (Unknown error))\r\nfinished. total time: 5.001s\r\n[tid=15208]]]]
[2023-09-06 22:53:52:459][L2_VIM][sn=17][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: oem get_ab_slot_status return ...\r\nFAILED (command write failed (Unknown error))\r\nfinished. total time: 5.000s\r\n[tid=15208]]]]
[2023-09-06 22:53:57:525][L2_VIM][sn=18][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: oem oeminforead-CUSTOM_VERSION_B return ...\r\nFAILED (command write failed (Unknown error))\r\nfinished. total time: 5.001s\r\n[tid=15208]]]]
[2023-09-06 22:54:02:587][L2_VIM][sn=19][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: oem oeminforead-PRELOAD_VERSION return ...\r\nFAILED (command write failed (Unknown error))\r\nfinished. total time: 5.001s\r\n[tid=15208]]]]
[2023-09-06 22:54:07:657][L2_VIM][sn=20][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: oem get_ab_slot_status return ...\r\nFAILED (command write failed (Unknown error))\r\nfinished. total time: 5.001s\r\n[tid=15208]]]]
[2023-09-06 22:54:12:725][L2_VIM][sn=21][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: oem oeminforead-PRELOAD_VERSION_B return ...\r\nFAILED (command write failed (Unknown error))\r\nfinished. total time: 5.001s\r\n[tid=15208]]]]
[2023-09-06 22:54:17:800][L2_VIM][sn=22][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: oem oeminforead-GROUP_VERSION return ...\r\nFAILED (command write failed (Unknown error))\r\nfinished. total time: 5.001s\r\n[tid=15208]]]]
[2023-09-06 22:54:22:875][L2_VIM][sn=23][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: oem get_ab_slot_status return ...\r\nFAILED (command write failed (Unknown error))\r\nfinished. total time: 5.001s\r\n[tid=15208]]]]
[2023-09-06 22:54:27:950][L2_VIM][sn=24][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: oem oeminforead-GROUP_VERSION_B return ...\r\nFAILED (command write failed (Unknown error))\r\nfinished. total time: 5.000s\r\n[tid=15208]]]]
[2023-09-06 22:54:33:011][L2_VIM][sn=25][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: oem get-custom-c-version return ...\r\nFAILED (command write failed (Unknown error))\r\nfinished. total time: 5.001s\r\n[tid=15208]]]]
[2023-09-06 22:54:43:137][L2_VIM][sn=26][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: oem oeminforead-SYSTEM_VERSION return ...\r\nFAILED (command write failed (Unknown error))\r\nfinished. total time: 5.000s\r\n[tid=15208]]]]
[2023-09-06 22:54:48:207][L2_VIM][sn=27][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: oem get_ab_slot_status return ...\r\nFAILED (command write failed (Unknown error))\r\nfinished. total time: 5.000s\r\n[tid=15208]]]]
[2023-09-06 22:54:53:268][L2_VIM][sn=28][RESULT: TRUE][HiSuite_SystemUpdate][[[DATA1: oem oeminforead-SYSTEM_VERSION_B return ...\r\nFAILED (command write failed (Unknown error))\r\nfinished. total time: 5.000s\r\n[tid=15208]]]]

This is what is written in the HiSuite log file.

After rebooting my phone it suddenly botted into EMUI's initial setup. Within the setup process the screen suddely froze and the phone went again into a boot loop.

I am afraid it's an hardware issue :(