D8 upgrade path: file module; Update #8001

New try. This time with fresh installed D7.22 and after that created an article and one basic ... thing.

OS: Android 4.2
Webserver: lighttpd/1.4.31 for KSWEB
PHP: 5.4.13
MySQL: 5.1.62
Drupal 7.22

Did all steps like in UPGRADE.TXT described.

One thing, that happened with my mirrored server too when loading update.php firts times: I get Internal Server Error. Even if I restart the server or not, I have to wait some time (one minute or so) and then update.php loads.

Result: Update went till the end but with one Error left:

The following updates returned messages

file module

Update #8001
Failed: Drupal\Core\Database\DatabaseExceptionWrapper: SQLSTATE[42000]: Syntax error or access violation: 1071 Specified key was too long; max key length is 1000 bytes: ALTER TABLE {file_usage} CHANGE `id` `id` VARCHAR(64) NOT NULL DEFAULT '' COMMENT 'The primary key of the object using the file.'; Array ( ) in Drupal\Core\Database\Connection->query() (line 554 of /mnt/sdcard/ksweb/htdocs/drupal/core/lib/Drupal/Core/Database/Connection.php).

After that I can only load the frontpage. With everything else I get 404.