im on version. 2.0.17.1 and want to upgrade to latest versions..

so here is my problem, i have uploaded the upgrade to my server, and ready to upgrade.
Checking applied upgrades:
cnt-2.2.x-to-2.3.0 Yes
upd-2.0.13-to-2.0.14 Yes
upd-2.0.15-to-2.0.16 Yes
upd-2.0.16-to-2.0.17 Yes
upd-2.0.17-to-2.0.18 Yes
upd-2.0.18-to-2.3.0 No
upd-2.3.0-to-2.3.1 No

It first says I have already installed 2.0.18 which is incorrect. as im on 2.0.17. as my admin screen says i am.

also i get this showing in query results :
SHOW COLUMNS FROM `m_cache_model` LIKE 'cache_data'
Error number: 1146
Error message: Table 'mydb_db1.m_cache_model' doesn't exist


if i proceed to :
Performing upd-2.0.18-to-2.3.0 upgrade

all checks ok

It runs through and says upgrade finished.
but also get this error

SELECT * FROM m_config WHERE (conf_modid = '0' AND conf_catid = '1') ORDER BY conf_order ASC
CREATE TABLE m_cache_model ( `cache_key` varchar(64) NOT NULL default '', `cache_expires` int(10) unsigned NOT NULL default '0', `cache_data` text, PRIMARY KEY (`cache_key`), KEY `cache_expires` (`cache_expires`) ) TYPE=MyISAM
Error number: 0
Error message: Database update not allowed during processing of a GET request

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It then gives me :
Apply next upgrade (upd-2.3.0-to-2.3.1)
with the above error showing in queries..

but nothing upgrades...

Help Please

help anyone?