Update multiple tables with join - mysql

Question

I can't handle the update statement, based on several tables. I've already viewed tutorials and forums, customized my code, tried, tried... But still doesn't work.
Code:
UPDATE `system`
JOIN System AS Sys ON service.Servicename_ID = Sys.FK_Service_ID
JOIN Hardware ON System.System_ID = Hardware.FK_System_ID
JOIN Verantwortlichkeit ON System.System_ID = Verantwortlichkeit.FK_System_ID
JOIN Zertifikate ON System.System_ID = Zertifikate.FK_System_ID
JOIN hardware_servername ON hardware.Servername = hardware_servername.Servername_ID
JOIN hardware_domaene ON hardware_domaene.Domaene_ID = hardware.Domaene
JOIN hardware_betriebssystem ON hardware_betriebssystem.Betriebssystem_ID = hardware.Betriebssystem
JOIN hardware_standort ON hardware_standort.Standort_ID = hardware.Standort
JOIN verantwortlichkeit_personen AS AA ON AA.Verantwortlichkeit_Personen_ID = system.Hersteller
JOIN verantwortlichkeit_personen AS AB ON AB.Verantwortlichkeit_Personen_ID = system.Externer_Partner
JOIN system_verfuegbarkeitsstufe ON system_verfuegbarkeitsstufe.Verfuegbarkeitsstufe_ID = system.Verfuegbarkeitsstufe
JOIN system_systemname ON system_systemname.Systemname_ID = system.Systemname
JOIN system_systemnummer ON system_systemnummer.Systemnummer_ID = system.Systemnummer
JOIN verantwortlichkeit_rolle ON verantwortlichkeit_rolle.Verantwortlichkeit_Rolle_ID = verantwortlichkeit.Rolle
JOIN verantwortlichkeit_personen AS A0 ON A0.Verantwortlichkeit_Personen_ID = verantwortlichkeit.Hauptverantwortlicher
JOIN verantwortlichkeit_personen AS A1 ON A1.Verantwortlichkeit_Personen_ID = verantwortlichkeit.Stellvertretung
JOIN verantwortlichkeit_personen AS A2 ON A2.Verantwortlichkeit_Personen_ID = verantwortlichkeit.Wissenstraeger_1
JOIN verantwortlichkeit_personen AS A3 ON A3.Verantwortlichkeit_Personen_ID = verantwortlichkeit.Wissenstraeger_2
JOIN verantwortlichkeit_personen AS A4 ON A4.Verantwortlichkeit_Personen_ID = verantwortlichkeit.Verantwortlichkeit_extern
SET
Sys.Systemnummer = '1',
Sys.Systembeschreibung = 'testbeschreubuzng',
Sys.Hersteller = 'Okan Koc',
Sys.Externer_Partner = 'Okan Koc',
Sys.`BKAG_Brugg` = b'1',
Sys.`BCIAG_Brugg` = b'1',
Sys.`Cables_Diverse_PL_CN_US_DE` = b'1',
Sys.`BINF` = b'1',
Sys.`BRAG_Kleindoettingen` = b'1',
Sys.`BRG_Wunstorf` = b'1',
Sys.`BGP_Nordhausen` = b'1',
Sys.`Pipes_Diverse_FR_PL_IT_US` = b'1',
Sys.`Ropes_BDAG_Birr` = b'1',
Sys.`HOLDING_Brugg` = b'1',
Sys.`BIAG_Brugg` = b'1',
Sys.`BPK_Brugg` = b'1',
Sys.`Dritte_Schule_Brugg_LithCom_usw` = b'1',
Sys.`Verfuegbarkeitsstufe` = '1',
Sys.`Datenverlust` = '1',
Sys.`Systemname` = 'Testsystem',
hardware.`Servername` = 'srvntstest',
hardware.`Domaene` = 'cables.bruggnet.com',
hardware.`Betriebssystem` = 'Windows Server 2012 R2',
hardware.`Lokale_Datenbank` = '1',
hardware.`Datenbank_SQL_Master` = 'SQLTEST',
hardware.`Instanzname` = 'Testinstanz',
hardware.`Standort` = 'RZ 1',
hardware.`Backup_mit` = 'Veeam',
verantwortlichkeit.`Rolle` = 'Systemtechnik',
verantwortlichkeit.`Hauptverantwortlicher` = 'David Grunder',
verantwortlichkeit.`Stellvertretung` = 'Robin Gloor',
verantwortlichkeit.`Wissenstraeger_1` = 'Okan Koc',
verantwortlichkeit.`Wissenstraeger_2` = 'Marc Gerber',
verantwortlichkeit.`Verantwortlichkeit_extern` = 'infor',
zertifikate.`Zertifikatname` = 'testzertifikat',
zertifikate.`Ablaufdatum` = '27.12.2001'
WHERE Sys.System_ID = 1

Answer 1

It's impossible to spot all possible errors in such a long query but the second line contains two errors as I see it, Service is not defined and you're joining with the System table itself
UPDATE `system`
JOIN System AS Sys ON service.Servicename_ID = Sys.FK_Service_ID
It needs to be changed to something like
UPDATE System Sys
JOIN Service ON Service.Servicename_ID = Sys.FK_Service_ID