OS 3.2.4.1237 Help!!!!!

Good day!!!
I erased my OS 3.2.4.1237 trying to downgrade the OS, but I didn't backup, and it doesn't let me install a previous version, and this OS hasn't been launched officially on the web site, i would like someone who has this version to upload it, please.
Please, help me i have a very important test soon and need my ti nspire cx cas!!!!
I erased my OS 3.2.4.1237 trying to downgrade the OS, but I didn't backup, and it doesn't let me install a previous version, and this OS hasn't been launched officially on the web site, i would like someone who has this version to upload it, please.
Please, help me i have a very important test soon and need my ti nspire cx cas!!!!