Got some help from a friend with a little steadier hands and got flash desoldered, read.
You can find full dump here, hapac2_dump.
On the hard config partition found this string:
15 00 04 00 05 40 28 08
changed to:
...
15 00 04 00 00 40 28 08
...
And got serial working:
22:02:49:375] S - QC_IMAGE_VERSION_STRING=BOOT.BF.3.1.1-00096␍␊
[22:02:49:380] S - IMAGE_VARIANT_STRING=DAABANAZA␍␊
[22:02:49:386] S - OEM_IMAGE_VERSION_STRING=CRM␍␊
[22:02:49:386] S - Boot Config, 0x00000020␍␊
[22:02:49:395] S - Core 0 Frequency, 0 MHz␍␊
[22:02:49:395] B - 262 - PBL, Start␍␊
[22:02:49:395] B - 1343 - bootable_media_detect_entry, Start␍␊
[22:02:49:400] B - 1688 - bootable_media_detect_success, Start␍␊
[22:02:49:405] B - 1702 - elf_loader_entry, Start␍␊
[22:02:49:405] B - 5148 - auth_hash_seg_entry, Start␍␊
[22:02:49:411] B - 7332 - auth_hash_seg_exit, Start␍␊
[22:02:49:416] B - 585100 - elf_segs_hash_verify_entry, Start␍␊
[22:02:49:425] B - 702298 - PBL, End␍␊
[22:02:49:425] B - 702323 - SBL1, Start␍␊
[22:02:49:435] B - 790902 - pm_device_init, Start␍␊
[22:02:49:435] D - 6 - pm_device_init, Delta␍␊
[22:02:49:444] B - 792433 - boot_flash_init, Start␍␊
[22:02:49:480] D - 46255 - boot_flash_init, Delta␍␊
[22:02:49:485] B - 842893 - boot_config_data_table_init, Start␍␊
[22:02:49:490] D - 3892 - boot_config_data_table_init, Delta - (419 Bytes)␍␊
[22:02:49:500] B - 850114 - clock_init, Start␍␊
[22:02:49:500] D - 7574 - clock_init, Delta␍␊
[22:02:49:514] B - 862220 - CDT version:2,Platform ID:8,Major ID:1,Minor ID:0,Subtype:0␍␊
[22:02:49:514] B - 865709 - sbl1_ddr_set_params, Start␍␊
[22:02:49:514] B - 870697 - cpr_init, Start␍␊
[22:02:49:526] D - 2 - cpr_init, Delta␍␊
[22:02:49:526] B - 875189 - Pre_DDR_clock_init, Start␍␊
[22:02:49:526] D - 4 - Pre_DDR_clock_init, Delta␍␊
[22:02:49:526] D - 13148 - sbl1_ddr_set_params, Delta␍␊
[22:02:49:536] B - 888891 - pm_driver_init, Start␍␊
[22:02:49:536] D - 2 - pm_driver_init, Delta␍␊
[22:02:49:598] B - 960002 - sbl1_wait_for_ddr_training, Start␍␊
[22:02:49:604] D - 30 - sbl1_wait_for_ddr_training, Delta␍␊
[22:02:49:613] B - 975622 - Image Load, Start␍␊
[22:02:49:757] D - 143582 - QSEE Image Loaded, Delta - (267732 Bytes)␍␊
[22:02:49:762] B - 1119700 - Image Load, Start␍␊
[22:02:49:770] D - 1445 - SEC Image Loaded, Delta - (2048 Bytes)␍␊
[22:02:49:773] B - 1130118 - Image Load, Start␍␊
[22:02:49:784] D - 15845 - APPSBL Image Loaded, Delta - (27608 Bytes)␍␊
[22:02:49:789] B - 1146383 - QSEE Execution, Start␍␊
[22:02:49:792] D - 58 - QSEE Execution, Delta␍␊
[22:02:49:796] B - 1152507 - SBL1, End␍␊
[22:02:49:798] D - 452295 - SBL1, Delta␍␊
[22:02:49:801] S - Flash Throughput, 1852 KB/s (297807 Bytes, 160736 us)␍␊
[22:02:49:806] S - DDR Frequency, 537 MHz␍␊
[22:02:50:151] ␍␊
[22:02:50:155] ␍␊
[22:02:50:155] RouterBOOT booter 6.43.4␍␊
[22:02:50:155] ␍␊
[22:02:50:155] RouterBOARD D52G-5HacD2HnD-TC␍␊
[22:02:50:158] ␍␊
[22:02:50:158] CPU frequency: 716 MHz␍␊
[22:02:50:161] Memory size: 128 MiB␍␊
[22:02:50:164] Storage size: 16 MiB␍␊
[22:02:52:156] ␍␊
[22:02:52:157] Press any key within 2 seconds to enter setup..␍␊
[22:02:54:169] ␍␊
[22:02:54:169] loading kernel... OK␍␊
[22:02:58:375] setting up elf image... OK␍␊
[22:02:58:573] jumping to kernel code␍␊
[22:03:17:503] Starting...␍␊
[22:03:18:943] Starting services...␍␊
[22:03:23:621] <0x1b>[1;1H<0x1b>[H<0x1b>[J<0x1b>cMikroTik 6.44 (stable)␍␍␊
[22:03:23:624] MikroTik Login: admin␍␊
[22:04:19:092] Password: ␍␊
[22:04:20:663] ␍␍␊
[22:04:20:664] ␍␍␊
[22:04:20:664] ␍␍␊
[22:04:20:664] ␍␍␊
[22:04:20:664] ␍␍␊
[22:04:20:664] ␍␍␊
[22:04:20:667] ␍␍␊
[22:04:20:667] ␍␊
[22:04:20:667] ␍ MMM MMM KKK TTTTTTTTTTT KKK␍␊
[22:04:20:671] ␍ MMMM MMMM KKK TTTTTTTTTTT KKK␍␊
[22:04:20:678] ␍ MMM MMMM MMM III KKK KKK RRRRRR OOOOOO TTT III KKK KKK␍␊
[22:04:20:684] ␍ MMM MM MMM III KKKKK RRR RRR OOO OOO TTT III KKKKK␍␊
[22:04:20:691] ␍ MMM MMM III KKK KKK RRRRRR OOO OOO TTT III KKK KKK␍␊
[22:04:20:698] ␍ MMM MMM III KKK KKK RRR RRR OOOOOO TTT III KKK KKK␍␊
[22:04:20:706] ␍␍␊
[22:04:20:706] ␍ MikroTik RouterOS 6.44 (c) 1999-2019 http://www.mikrotik.com/␍␊
[22:04:20:711] ␍␍␊
[22:04:20:713] [?] Gives the list of available commands␍␊
[22:04:20:716] ␍command [?] Gives help on the command and list of arguments␍␊
[22:04:20:722] ␍␍␊
[22:04:20:724] ␍[Tab] Completes the command/word. If the input is ambiguous,␍␊
[22:04:20:728] ␍ a second [Tab] gives possible options␍␊
[22:04:20:735] ␍␍␊
[22:04:20:735] ␍/ Move up to base level␍␊
[22:04:20:738] ␍.. Move up one level␍␊
[22:04:20:741] ␍/command Use command at the base level␍␊
[22:04:20:745] ␍<0x1b>[9999B␍<0x1b>[9999B<0x1b>Z <0x1b>[6n␍␍␍␍[admin@MikroTik] > ␍[admin@MikroTik] >