Lenovo thinkbook 14 g6 abp 21kj002jpb 14 amd ryzen 5 7530u July 8, 2019 16 32 64 128 Lenovo thinkbook 14 ryzen Lenovo thinkbook 15 g2 ryzen 7 4700u Lenovo thinkbook 14 2020 Thinkbook ryzen 7