As a seasoned Full Stack Developer with extensive experience in not only React Native but ReactJS as well, I am no stranger to the intricate world of SDK upgrades. Throughout my career, I have consistently tackled and conquered challenges just like yours. I am confident that my comprehensive understanding of SDKs' mechanics and intricacies, combined with my excellent debugging abilities, will prove invaluable in identifying and rectifying the series of errors affecting your app post-upgrade from 50 to 51.
Furthermore, my broad skill set extends beyond just React Native; I am adept with CSS3, Redux and various other tools necessary for holistic bug-fixing. Moreover, my commitment to consistent self-improvement means that I stay abreast of all new industry developments and technologies, ensuring your app remains optimized even after the initial bugs are fixed.
As a person, I'm known for my aggression when it comes to troubleshooting. I don't rest until all issues have been resolved, and my clients' needs have been met. Though bugs can be unnerving, working together we can not only fix them but also ensure your app is future-proofed against similar problems.
In conclusion, choosing me for your bug fixing task will not only guarantee swift resolution but also a thorough inspection of your codebase. Let's put an end to these frustrating error messages once and for all and get your project back on track. Looking forward to partnering with you!