Brain Tumor Segmentation in Sub-Sahara Africa with Advanced Transformer and ConvNet Methods: Fine-Tuning, Data Mixing and Ensembling. - Toufiq Musah; Chantelle Amoako-Atta; John Amankwaah Otu; Lukman E. Ismaila; Swallah Alhaji Suraka; Oladimeji Williams; Isaac Tigbee; Kato Hussein Wabbi; Samantha Katsande; Kanyiri Ahmed Yakubu; Adedayo Kehinde Lawal; Anita Nsiah Donkor; et al. (MIRASOL@MICCAI, 2025)