You go to database of Magento 2 site, run this SQL command:
SELECT * FROM core_config_data WHERE path LIKE '%dev%'
Change ‘dev/js/merge_files’ to '0’
Then run deploy theme command with SSH to see if it works?
You go to database of Magento 2 site, run this SQL command:
SELECT * FROM core_config_data WHERE path LIKE '%dev%'
Change ‘dev/js/merge_files’ to '0’
Then run deploy theme command with SSH to see if it works?