# Is it possible to downgrade SSTables from ms format (trie indexed)  back to me  (default in 2026.1)? Will upgradesstable rewrite sstables back to the old format?

**URL:** <https://forum.scylladb.com/t/is-it-possible-to-downgrade-sstables-from-ms-format-trie-indexed-back-to-me-default-in-2026-1-will-upgradesstable-rewrite-sstables-back-to-the-old-format/5373>\
**Category:** ScyllaDB\
**Tags:** administration, sstable, upgrade, configuration\
**Created:** [May 20, 2026, 5:58am UTC](https://forum.scylladb.com/t/is-it-possible-to-downgrade-sstables-from-ms-format-trie-indexed-back-to-me-default-in-2026-1-will-upgradesstable-rewrite-sstables-back-to-the-old-format/5373 "2026-05-20T05:58:33Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Guy](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.scylladb.com/guy/32/9_2.png) [@Guy](https://forum.scylladb.com/u/Guy)\
**Post date:** [May 20, 2026, 5:58am UTC](https://forum.scylladb.com/t/is-it-possible-to-downgrade-sstables-from-ms-format-trie-indexed-back-to-me-default-in-2026-1-will-upgradesstable-rewrite-sstables-back-to-the-old-format/5373/1 "2026-05-20T05:58:33Z")

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> [@](#):
>
> **[Originally from the User Slack](https://scylladb-users.slack.com/)**
> 
> ![Ivan_Zalozhnykh](https://us1.discourse-cdn.com/flex016/uploads/scylladb/original/2X/8/8b8cd815c71fb05092acc7845fe3b9ae27939f04.jpeg) @Ivan\_ZalozhnykhIvan\_Zalozhnykh\*\*:\*\* Hi, is it possible to downgrade `sstable_format` from `ms` (trie indexed) back to `me` (default in 2026.1)? Will upgradesstable rewrite sstables back to the @avild format?
> 
> ![avi](https://us1.discourse-cdn.com/flex016/uploads/scylladb/original/1X/b5e08becda8d9df1abff1d3a2d9ffe1126ac3fc6.jpeg) @avi\*\*:\*\* yes and yes (upgradesstables -a). But why?
> 
> ![Ivan_Zalozhnykh](https://us1.discourse-cdn.com/flex016/uploads/scylladb/original/2X/8/8b8cd815c71fb05092acc7845fe3b9ae27939f04.jpeg) @Ivan\_Zalozhnykh\*\*:\*\* Just want to have a rollback plan