Am not technical...I downloaded .bat file and Toolbox.@///MoH Actually tipped me off.
Basically if you have a Telkom B315s-936 then you can force B38/41 on Rain by using one of the huawei band tools.
Using the huawei_band_tool_v0.1 Run the .bat file I edited (LTE_2500_TDD_Rain_b38) to force the B315 to Band 41 which is actually a range from 2496 – 2690Mhz which covers the Rain 2600MHz frequency.
Using the E5186 Toolbox_latest You need to inject this in the api settings net-mode 0000010000000000 to force band 41 on this tool.
Tested it on 2 B315 from Telkom. One branded and one not brand both worked. So if you using a B315s-936 you can now force B41 on Rain for possibly better speeds if you don't have a B618.
Can you please post a step by step guide to do this