After the previous game update, which added X-Trap, there have been problems with mBot's multiclient.
Due to time constraints and unforeseen issues while updating the bot for the new game version, there is no solution available at the moment.
Subsequently, purchases for the iSRO and SRO-R versions of the bot have been disabled temporarily until this problem is fixed.
Additionally, mBot for iSRO and SRO-R are free to use during this time as well.
Please note that the bot versions for private server (vSRO110 and pSRO-BR) are not impacted by this problem and purchases for these bot version continue as usual.