I wrote a mail about software update for the S7 Slim from Huawei and I received the following answer:
Thank you for contacting Huawei device.
Sorry about that the Android 2.2 is the latest version to the S7-201U. so you cannot upgrade to the Android 2.3 to your S7-201U.
Once again thank you for contacting Huawei device
Huawei Device Customer Care Team
发件人: Cuc Ioan [mailto:firstname.lastname@example.org]
发送时间: 2012年5月1日 21:26
主题: Update software Android